The left must confront the politics of removing carbon from the atmosphere – a topic rapidly making its way to the top of the climate agenda. We here examine the technology of direct air capture, tracing its intellectual origins and laying bare the political economy of its current manifestations. We find a space crowded with ideology-laden metaphors, ample fossil-capital entanglements and bold visions for a new, ethereal frontier of capital accumulation. These diversions must be cut short if a technology (...) with the capacity to help repair at least some climate damage is to be of any use. Only socialising the means of removal will allow this to happen. (shrink)

The recent ethical debate concerning the implementation of carbon dioxide removal (CDR) has expanded the traditional scope of ethical analysis to investigate the appropriate role of CDR within the larger climate change mitigation discussion. Specifically, the recent scholarship is embedded in the disputed sustainable development landscape that presents various and competing visions of desirable futures. This article unpacks and clarifies the discussion between Darrel Moellendorf and Henry Shue as representatives of two camps in the recent debate, the former (...) supporting carbon removal to achieve poverty-targeting sustainable development and the latter rejecting overreliance on CDR’s potential. Finally, moving beyond this discussion, the article proposes that a capabilities approach to CDR can adequately inform the debate, tackling some important limitations in the recent literature by offering a broader account of human well-being relevant to CDR implementation. (shrink)

The potential upscaling of carbon dioxide removal (CDR) technologies to meet states’ net-zero targets may enable individuals to remove emissions by purchasing carbon removal certificates. In this paper, I argue for two concepts of individual responsibility to capture the moral responsibility of individuals to remove carbon dioxide from the atmosphere through CDR technologies. The first is that of liability, a direct responsibility to remove carbon in order to minimize one’s carbon footprint. The second (...) is a shared political responsibility to remove carbon that individuals have by virtue of being part of weak collectives responsible for mitigating climate change or by virtue of participating in structures that contribute to climate change. I argue that the concept of shared political responsibility can be used to determine how CDR technologies should or should not be implemented. Finally, I discuss how these two responsibilities are related. (shrink)

This paper analyzes the nonepistemic value judgments involved in modeling Carbon Dioxide Removal (CDR) techniques. The comparably high uncertainty of these techniques gives rise to epistemic risk when large-scale CDR is relied upon in most scenario evidence. Technological assumptions on CDR are thus entangled with nonepistemic value judgments. In particular, the reliance on large-scale CDR implies shifting risk to future generations and thereby gives a one-sided answer to questions of intergenerational justice. This bias in integrated assessment modeling is (...) problematic given the policy-advising role of integrated modeling. Modeling climate mitigation should focus on transforming these implicit value positions into explicit scenario parameters and should aim to provide scenario evidence on the complete array of value-laden mitigation strategies. -/- . (shrink)

Meeting the net zero emission targets set by many states after the Paris Agreement to help keep global warming well below 2°C above pre-industrial levels will require carbon dioxide removal technologies (CDRs). Several moral concerns arise if the contribution of CDRs to achieving net zero is not specified, but such concerns can be met by defining a permissible target for CDRs. This paper proposes a framework for defining the permissible contribution of CDRs to the net zero targets of (...) individual states. The framework identifies three categories of emissions for which the permissibility of CDRs varies depending on the ethical costs of both emission abatement and CDRs. We argue that a) luxury emissions should be reduced without using CDRs; b) emissions for full membership in society should be abated by structural efforts, although using CDRs is permissible, given certain conditions; and c) CDRs are permissible for residual emissions because otherwise net zero targets cannot be reached. (shrink)

The roles digital media-technologies play in raising public issues relating to emerging technologies and their potential for engaging publics with science and policy assessments is a lively field of inquiry in Science and Technology Studies (STS). This paper presents an analysis of controversies over proposals for the large-scale removal of atmospheric carbon dioxide (CDR). The study combines a digital method (web-querying) with document analysis to map debates about two CDR approaches: bioenergy with carbon capture and storage (BECCS) (...) and afforestation. In the first step, we locate actors using the web to engage with BECCS and afforestation and map their alignments in relation to competing framings of CDR. In a second step, we examine the devices deployed by UK-based actors to evidence and contest the feasibility of BECCS and afforestation. Our analysis shows that policy distinctions between “natural” and “engineered” CDR are used flexibly in practice and do not map neatly onto actor engagement with BECCS and afforestation. We highlight the predominance of cross-cutting techno-economic expertise and argue that framings of CDR as a solution to governing climate change may contribute to public disengagement from climate policy processes. The paper reflects on methods for studying controversies, publics, and issues emerging around processes of technoscientific assessment. (shrink)

Carbon offsets either remove greenhouse gases from the air or prevent emissions thereof. They face questions both economic (is ‘net zero’ really reached?) and moral. I defend the moral permissibility of off-sets. They likely shift climate harms around, but that need not be unjust—and in any case we cannot avoid doing that.

ABSTRACT Moral hazards are ubiquitous. Green ones typically involve technological fixes: Environmentalists often see ‘technofixes’ as morally fraught because they absolve actors from taking more difficult steps toward systemic solutions. Carbon removal and especially solar geoengineering are only the latest example of such technologies. We here explore green moral hazards throughout American history. We argue that dismissing (solar) geoengineering on moral hazard grounds is often unproductive. Instead, especially those vehemently opposed to the technology should use it as an (...) opportunity to expand the attention paid to the underlying environmental problem in the first place, actively invoking its opposite: ‘inverse moral hazards’. (shrink)

Carbon offsetting can be loosely characterized as a mechanism by which an organization or individual contributes to a scheme that is projected either to remove carbon dioxide from the atmosphere or to deliver carbon dioxide emission reductions on the part of other organizations or individuals. An activity that has been offset therefore purports to make no long-term net contribution to atmospheric greenhouse gas concentrations. The ethical basis for using carbon offsetting as an approach to tackling climate (...) change is very much contested. We seek to expose some of the underlying reasons for these ethical disagreements. We show that they relate both to empirical disagreements about what the likely benefits of offsetting are and, more fundamentally, to principled disagreements about the right way to discharge duties to deliver carbon reductions. (shrink)

This paper provides an overview of how the social licence to operate (SLO) of the Swedish forest industry has been developed over time. For many decades, the SLO has been implicitly operating, shaped by dominant discourses of the day. We can see these SLOs through the agrarian, industrial and post-industrial era. During this era, a focus on bioenergy has seen whole stump removal become a more mainstream practice. This practice gained increasingly widespread acceptance when framed as a necessary response (...) to climate change. However, research has identified problems associated with whole stump removal, including decreased biodiversity, nutrient removal, soil acidification and mechanical soil preparation threatening soil carbon stores. In light of these recent developments, this paper examines the role of knowledge production and accepted discourses in the creation and maintenance of an industry’s SLO. By providing an overview of key legislative changes in the history of forest management alongside data from .. (shrink)

Compared with traditional technological innovation modes, green technology innovation is more targeted for low carbon development and critical support for countries worldwide to combat climate change. The impact of green technology innovation on carbon emissions is considered in terms of fixed effect and mediating effect models through industrial structure upgrading. For this purpose, the sample dataset of 30 provincial administrative areas in China from 2008 to 2020 is employed. The results demonstrate that green technology innovation exerts significantly inhibitory (...) effects on carbon emissions, whose conclusion still holds after removing municipalities and replacing the dependent variable. Industrial structure upgrading is vital for green technology innovation to diminish carbon emissions. There is significant regional heterogeneity in the effects of green technology innovation on carbon emissions, i.e., the direct and indirect impact of green technology innovation on carbon emission reduction is significant in the eastern-central area, but its effect is insignificant in the western region. Therefore, it is essential to realize carbon emission reduction by further bolstering green technology innovation and accelerating industrial structure upgrading to fulfill the synergy of technology and structure. (shrink)

In recent years, the target of reaching “net zero” emissions by 2050 has come to the forefront of global climate politics. Net zero would see carbon emissions matched by carbon removals and should allow the planet to avoid dangerous climate change. But the recent prominence of this goal should not distract from the fact that there are many possible versions of net zero. Each of them will have different climate justice implications, and some of them could have very (...) negative consequences for the world's poor. This article demonstrates the many ambiguities of net zero, and argues in favor of a net zero strategy in which those who can reasonably bear the burden adopt early and aggressive mitigation policies. We also argue for a net zero strategy in which countries place the lion's share of their faith in known emissions reduction approaches, rather than being heavily reliant on as-yet-unproven “negative emissions techniques.” Our overarching goal is to put net zero in its place, by providing a clear-sighted view of what net zero will achieve, and where the “net” in net zero needs to be tightened further if the world is to achieve climate justice. (shrink)

To reduce CO2 emissions requires greater reliance on renewable sources of energy for generating electricity, especially adoption of large-scale wind generation. This study investigates possible approaches and/or policies that increase efficient use of renewable energy and reduce greenhouse gas emissions in a cost effective manner. We develop a constrained optimization model of two electricity systems to identify the impact of increasing wind generating capacity and examine how carbon prices (taxes, allowances) impact the penetration of wind power into the electricity (...) grids. Rather than employ engineering cost functions, marginal cost functions are estimated using hourly offer data from the Alberta Electric System Operator. We determine optimal removal of coal generating facilities as greater levels of wind capacity are installed in an integrated Alberta-BC electricity system; and examine the economic costs and institutional incentives that affect the ability to store intermittent wind-generated power in BC’s hydro reservoirs during low demand. The marginal shadow price of storage is zero, whichindicates that there is more than enough water behind the dams given Alberta’s relatively small demand for storage and limited intertie transmission capacity. (shrink)

Much of the work on the ethics of climate engineering over the last few years has focused on the front-end of the potential timeline for climate intervention. Topics have included the initial taboo on bringing the discussion of climate engineering into the open, guidelines to put in place before commencing research, and governance arrangements before first deployment. While this work is clearly important, the current paper considers what insights can be gleaned from considering the tail-end, that is, by using the (...) requirement for future cessation as a criterion for any acceptable climate engineering strategy. After showing that time-limited interventions are a key part of the rhetoric of leading climate engineering advocates, the paper examines the implications of imposing a ‘cessation requirement’ on solar radiation management and carbon dioxide removal strategies. Consideration of a cessation requirement turns out to reveal a great deal about what ought to be happening now, before any decision to proceed with climate engineering deployment has been taken. (shrink)

One branch of the responsible innovation literature involves the direction of innovation: if the public or decision-makers can or should direct innovation, how should innovation be directed? This paper explicates a case study where directionality – the plurality of plausible values for innovation – is directly implicated. In this case, a key technology may require a strategy for innovation, but there are contrasting normative reasons to drive that innovation in different ways, reflecting two distinct moral values, ‘effectiveness’ and responsiveness to (...) ‘need’. In this case, carbon dioxide removal, these values may well conflict. Strategically deploying carbon dioxide removal in a cost-effective manner would tend to support siting it in regions where there are significant oil and gas operations. In contrast, strategically deploying carbon dioxide removal in response to need would tend to support siting it in regions where expected demand for the technology is required for development. [Open access]. (shrink)

Many geoengineering projects have been proposed to address climate change, including both solar radiation management and carbon removal techniques. Some of these methods would introduce additional compounds into the atmosphere or the ocean. This poses a difficult conundrum: Is it permissible to remediate one pollutant by introducing a second pollutant into a system that has already been damaged, threatened, or altered? We frame this conundrum as the ‘‘Problem of Permissible Pollution.’’ In this paper, we explore this problem by (...) taking up ocean fertilization and advancing an argument that rests on three moral claims. We first observe that pollution is, in many respects, a context-dependent matter. This observation leads us to argue for a ‘‘justifiability criterion.’’ Second, we suggest that remediating actions must take into account the antecedent conditions that have given rise to their consideration. We call this second observation the ‘‘antecedent conditions criterion.’’ Finally, we observe that ocean fertilization, and other related geoengineering technologies, propose not strictly to clean up carbon emissions, but actually to move the universe to some future, unknown state. Given the introduced criteria, we impose a ‘‘future-state constraint’’. We conclude that ocean fertilization is not an acceptable solution for mitigating climate change. In attempting to shift the universe to a future state geoengineering sidelines consideration of the antecedent conditions that have given rise to it —conditions, we note, that in many cases involve unjustified carbon emissions —and it must appeal to an impossibly large set of affected parties. (shrink)

In addition to carbon dioxide, it is becoming increasingly clear that there are numerous other potent agents of anthropogenic forcing (e.g. methane, ozone, black carbon) at work in the climate system today. The typical ethical framing of climate change has not yet accommodated this complexity. In addition, geoengineering has often been presented as a Plan B that would simply counter unintentional (and positive) anthropogenic forcing with intentional (and negative) anthropogenic forcing. This paper attempts to better address the complexity (...) by outlining an ethical framework for reducing all anthropogenic forcing, a position it labels the 'climate imperative.' The paper considers geoengineering alongside various other anthropogenic forcing activities and discusses what the climate imperative would say about each of them. On this analysis, GHG and black carbon reductions remain a priority. At the same time, the framing reveals a significant ethical difference between geoengineering through solar radiation management and through carbon dioxide removal. (shrink)

Recent scientific studies suggest that the destabilisation of the earth's climate and biodiversity loss are not separate, but interdependent phenomena. In this context, some have proposed the creation of a ‘Global Safety Net’ of ecoregions that should be preserved to stop further biodiversity loss, preventing at the same time the growth of CO2 emissions produced by deforestation and allowing natural carbon removal. In this article, I suggest that a first step to achieve this might be to replace permanent (...) sovereignty over natural resources in these areas with permanent guardianship. I propose to take some inspiration from a model that has already been implemented over an entire continent with a fair degree of success. In 1959, the Antarctic Treaty froze the sovereign claims of seven countries over Antarctica. However, these countries plus 47 others today have been remarkably successful at jointly preserving the continent for peace, science, and the protection of the environment, especially since the signature of the Environmental Protocol in 1991. After outlining some principles that could give form to a Global Environmental Protocol for Ecoregions, I address a series of objections and offer some concluding remarks. (shrink)

Although Indic perspectives toward nature are now well documented, climate engineering discussions seem to still lack the views from Indic or other non‐Western sources. In this article, I will apply some of the Hindu and Jain concepts such as karma, nonviolence (Ahiṃsā ), humility (Vinaya ), and renunciation (Saṃnyāsa ) to analyze the two primary climate geoengineering strategies of solar radiation management (SRM) and carbon dioxide removal (CDR). I suggest that Indic philosophical and religious traditions such as Hinduism, (...) Buddhism, and Jainism offer ethical concepts to call for humility in all acts of climate engineering leading to a favoring of CDR over SRM and a favoring of lifestyle changes (particularly vegetarianism) over both. I demonstrate these concepts by introducing the five great elements from the Hindu philosophy, two Hindu legends from Hindu mythology, the Indic ethical ideas of karma, renunciation, and humility, and the moral authority of Gandhi. (shrink)

Non-technical summary: -/- When developing and deploying negative emissions technologies (NETs), little attention has been paid to where. On the one hand, one might develop NETs where they are likely to contribute most to global mitigation targets, contributing to a global climate solution. On the other hand, one might develop NETs where they can help support development on a regional basis, justified by regional demands. I defend these arguments and suggest that they reflect the values of efficiency and responding to (...) need, respectively. To the extent that these values conflict, they introduce what I call the Need-Efficiency Trade-off Effect (‘NET Effect’). -/- Technical summary: -/- Unlike other geoengineering methods, the effectiveness of negative emissions technologies (NETs) tends to be sensitive to regional siting. This paper argues that this point raises morally and legally important implications by identifying a trade-off between ‘efficiency’ and ‘need’. First, it introduces two arguments justifying NETs: one focused on contributions to global mitigation and the other focused on contributions to regional development. Second, reflecting the two arguments, the paper discusses the moral values of efficiency and need, respectively. For instance, if the strategy is to try to use NETs to maximize expected mitigation contributions to reflect efficiency, then deployment should occur in regions with the best prospects for success (e.g. Western countries). However, if the strategy is to try to use NETs to improve the chances of simultaneous development and mitigation to respond to need, then deployment should occur in regions with limited development and expected growth of demand for NETs (e.g. Asian countries). When these values conflict, I call that a Need-Efficiency Trade-off Effect (‘NET Effect’). The paper concludes by considering the NET Effect in the context of bioenergy with carbon capture and storage as well as direct air carbon capture and storage. [Open access]. (shrink)

The Royal Society's landmark report on geoengineering is predicated on a particular account of the context and rationale for intentional manipulation of the climate system, and this ethical framework probably explains many of the Society's conclusions. Critical reflection on the report's values is useful for understanding disagreements within and about geoengineering policy, and also for identifying questions for early ethical analysis. Topics discussed include the moral hazard argument, governance, the ethical status of geoengineering under different rationales, the implications of understanding (...) geoengineering as a consequence of wider moral failure, and ethical resistance to invasive interventions in environmental systems. (shrink)

"Although the task of formulating an appropriate policy response to the problem of anthropogenic climate change is one that raises a number of very difficult normative issues, environmental ethicists have not played an influential role in government deliberations. This is primarily due to their rejection of many of the assumptions that structure the debates over policy. This book offers a philosophical defense of these assumptions, in order to overcome the major conceptual barriers to the participation of philosophers in these debates. (...) There are five important barriers: First, the policy debate presupposes a stance of liberal neutrality, as a result of which it does not privilege any particular set of environmental values over other concerns. Second, it assumes ongoing economic growth, along with a commitment to what is sometimes called a weak sustainability framework when analyzing the value of the bequest being made to future generations. Third, it treats climate change as fundamentally a collective action problem, not an issue of distributive justice. Fourth, there is the acceptance of cost-benefit analysis, or more precisely, the view that a carbon pricing regime should be guided by our best estimate of the social cost of carbon. And finally, there is the view that when this calculation is undertaken, it is permissible to discount costs and benefits, depending on how far removed they are from the present. This book attempts to make explicit and defend these presuppositions, and in so doing offer philosophical foundations for the debate over climate change policy"--. (shrink)

Recent research has shown that a phase transformation of diamond to a different form of carbon is involved when diamonds are polished in the traditional fashion. The question as to how this phase transformation is activated and maintained to produce high wear rates is of great technological interest since it may radically change the way we view the processing of diamond. This paper describes the use of Raman spectroscopy to examine debris produced on the diamond polishing wheel, both during (...) its preparation and during polishing. In addition, polished diamond surfaces were examined for the possible existence of non-diamond surface layers in an attempt to identify material removal mechanisms. Raman spectroscopy proves ideal for these analyses because its relatively high spatial resolution is well suited to the analysis of small wear features and debris particles, and because of the wealth of information it reveals about chemical structure. This level of structural information has been lacking in previous analyses of diamond polishing debris. In addition to the non-diamond carbon found in the wear debris, significant quantities of two iron oxides, magnetite (Fe3O4) and haematite (α-Fe2O3), were also found. An interesting observation was that a transformation from magnetite to haematite could be induced either by using high power laser excitation or by frictional heating during polishing. It is suggested that some of the Raman peaks previously attributed to lonsdaleite might better be explained by the presence of these oxides. (shrink)

Both biofuels and BECCS serve the purpose of reducing the concentration of carbon in the atmosphere, biofuels by reducing the quantity of CO2 newly added and BECCS by removing the CO2 already emitted. Both rely on the large-scale growth of biomass and hence compete with food production for arable land. Consequently, the implementation of both at large scales potentially endangers food security. Given this conflict and the need for climate action, this paper discusses whether there are differences between the (...) ethical implications of mitigation by biofuels and geoengineering with BECCS. We apply a principlist approach, specifying and weighting four key principles of climate ethics: the polluter-pays principle, the ability-to-pay principle, the equal-per-capita principle, and the procedural involvement principle. Because the ethical and practical implications of BECCS and biofuels have many parallels, applying these four principles identifies relevant moral differences to decide between these two technologies. (shrink)

The strongest arguments for the permissibility of geoengineering (also known as climate engineering) rely implicitly on non-ideal theory—roughly, the theory of justice as applied to situations of partial compliance with principles of ideal justice. In an ideally just world, such arguments acknowledge, humanity should not deploy geoengineering; but in our imperfect world, society may need to complement mitigation and adaptation with geoengineering to reduce injustices associated with anthropogenic climate change. We interpret research proponents’ arguments as an application of a particular (...) branch of non-ideal theory known as “clinical theory.” Clinical theory aims to identify politically feasible institutions or policies that would address existing (or impending) injustice without violating certain kinds of moral permissibility constraints. We argue for three implications of clinical theory: First, conditional on falling costs and feasibility, clinical theory provides strong support for some geoengineering techniques that aim to remove carbon dioxide from the atmosphere. Second, if some kinds of carbon dioxide removal technologies are supported by clinical theory, then clinical theory further supports using those technologies to enable “overshoot” scenarios in which developing countries exceed the cumulative emissions caps that would apply in ideal circumstances. Third, because of tensions between political feasibility and moral permissibility, clinical theory provides only weak support for geoengineering techniques that aim to manage incoming solar radiation. (shrink)

There is a need for all industries, including healthcare, to reduce their greenhouse gas emissions. In anaesthetic practice, this not only requires a reduction in resource use and waste, but also a shift away from inhaled anaesthetic gases and towards alternatives with a lower carbon footprint. As inhalational anaesthesia produces greenhouse gas emissions at the point of use, achieving sustainable anaesthetic practice involves individual practitioner behaviour change. However, changing the practice of healthcare professionals raises potential ethical issues. The purpose (...) of this paper is twofold. First, we discuss what moral duties anaesthetic practitioners have when it comes to practices that impact the environment. We argue that behaviour change among practitioners to align with certain moral responsibilities must be supplemented with an account of institutional duties to support this. In other words, we argue that institutions and those in power have second-order responsibilities to ensure that practitioners can fulfil their first-order responsibilities to practice more sustainably. The second goal of the paper is to consider not just the nature of second-order responsibilities but the content. We assess four different ways that second-order responsibilities might be fulfilled within healthcare systems: removing certain anaesthetic agents, seeking consensus, education and methods from behavioural economics. We argue that, while each of these are a necessary part of the picture, some interventions like nudges have considerable advantages. (shrink)

Climate change poses grave risks to food security, and mitigation and adaptation actions have so far been insufficient to lessen the risk of climate-induced violations of the right to food. Could safeguarding the right to food, then, justify some forms of geoengineering? This article examines geoengineering through the analytical lens of the right to food. We look at the components of food security and consider how the acceptability of geoengineering relates to the right to food via its impacts on these (...) components. Our examination shows that results vary greatly between different forms of geoengineering: while some forms of geoengineering fail to respect the right to food, certain other forms may even become obligatory to protect the right to food. It appears that there is no support for aerosol-based solar radiation management, whereas some carbon dioxide removal methods can help protect or promote the right to food. The ethical challenges related to carbon dioxide removal methods are, we note, similar to those that will also be faced in the course of climate change mitigation. (shrink)

Today, the most powerful research technique available for assigning chronometric age to human cultural objects is radiocarbon dating. Developed in the United States in the late 1940s by an alumnus of the Manhattan Project, radiocarbon dating measures the decay of the radioactive isotope carbon-14 (C14) in organic material, and calculates the time elapsed since the materials were removed from the life cycle. This paper traces the interdisciplinary collaboration between archaeology and radiochemistry that led to the successful development of radiocarbon (...) dating in the early 1950s, following the movement of people and ideas from Willard Libby's Chicago radiocarbon laboratory to museums, universities and government labs in the United States, Australia, Denmark and New Zealand. I show how radiocarbon research built on existing technologies and networks in atomic chemistry and physics but was deeply shaped by its original private philanthropic funders and archaeologist users, and ultimately remained to the side of many contemporaneous Cold War scientific and military projects. (shrink)

Synthetic foods advocates offer the promise of efficient, reliable, and sustainable food production. Engineered organisms become factories to produce food. Proponents claim that through this technique important barriers can be eliminated which would facilitate the production of traditional foods outside their climatic range. This technique would allow reducing food miles, secure future supply, and maintain quality and taste expectations. In this paper, we examine coffee production via biobased means. A startup called Atomo Coffee aims to produce synthetic coffee with the (...) aim of saving ‘the taste of coffee’ from the effects of climate change. This decontextualisation of coffee production ignores the current and historical contributions of coffee farmers in two ways: the traditional varieties in taste of coffee and their cultural significance, and the potential shade-grown coffee plantations have in capturing carbon. In addition, synthetic coffee may lead to the loss of agricultural biodiversity and the removal of resources away from production systems that provide a safe space for tropical flora and fauna. How should the ‘taste of coffee’ be owned? We investigate the property regimes under which we could consider owning the taste of coffee as a ‘synthetic’ agrobiodiversity to help identify rights and responsibilities. Building on this analysis, we consider dimensions of responsible innovation and social justice to help guide synthetic foods as an agricultural innovation. (shrink)

This paper deals with an analysis of debris produced during the polishing of diamond. The debris is carefully collected 'as ejected' to shorten the history of the freshly removed material. Using high-resolution electron microscopy as well as electron-energy-loss spectroscopy, the structure of the material is revealed and analysed in terms of density, percentage of sp 2 hybridized carbon, and oxygen content. Debris from polishing in the so-called hard and soft directions were involved in this investigation. Overall the structure of (...) all debris is amorphous carbon. The material appears to be composed of small clusters, some nanometres in diameter, in which the graphite basal planes can be recognized. Very few and very small nanometre-sized diamond particles were found in the debris from polishing in the hard direction. The results support a polishing mechanism based on a mechanically induced transformation of diamond to graphite, after which material removal easily occurs. The well-known anisotropy observed in polishing can be explained satisfactorily on the basis of this model. Finally, in appendices, the art of polishing and the role of the black powder during preparation of the scaife are discussed. (shrink)

Geoengineering is a technological response to anthropogenic climate change. There are two kinds of geoengineering: Solar Radiation Management (SRM) and Carbon Dioxide Removal (CDR). SRM aims at reducing the amount of incoming solar light and CDR at reducing the CO2 concentration in the atmosphere. Over the past decades, geoengineering has moved from a fringe proposal to a more mainstream contender along with mitigation and adaptation to avert climate change. However, it faces important ethical challenges.

Free radicals are generally perceived as highly reactive species which are harmful to biological systems. There are, however, a number of enzymes that use carbon‐based radicals to catalyse a variety of important and unusual reactions. The most prominent example is ribonucleotide reductase, an enzyme which is crucial for the synthesis of DNA. In general, radicals are used to remove hydrogen from unreactive positions in the substrate, and in this way the substrate is activated to undergo chemical transformations that would (...) otherwise be difficult to achieve. Several different mechanisms have evolved which allow enzymes to generate and maintain radicals in increasingly aerobic enviroments. An unexpected finding is the existance of stable protein‐based radicals, residing on a variety of amino‐acid side chains, which serve to link the radical‐generating and catalytic sites and to store the radical between turnovers. (shrink)

Geoengineering is typically defined as a techno-scientific response to climate change that differs from mitigation and adaptation, and that includes diverse individual technologies, which can be classified as either solar radiation management or carbon dioxide removal. We analyse the representation of geoengineering on Wikipedia as a way of opening up this dominating, if contested, model for further debate. We achieve this by contrasting the dominating model as presented in the encyclopaedic article texts with the patterns of hyper-link associations (...) between the articles. Two datasets were created tracing the geoengineering construct on Wikipedia, shedding light on its boundary with its context, as well as on its internal structure. The analysis shows that the geoengineering category tends to be associated on Wikipedia primarily with atmospheric solar radiation management rather than land-based carbon dioxide removal type technologies. The results support the notion that the dominant model of defining and classifying geoengineering technology has been beneficial for solar radiation management type technologies more than for land-based carbon dioxide removal ones. The article also demonstrates that controversy mapping with Wikipedia data affords analysis that can open up dominating definitions and classifications of technologies, and offer resistance to their frequent naturalising and decontextualising tendencies. This work is in line with recent work on digital sociology, but the article contributes a new methodology and reports on the first empirical application of controversy mapping using Wikipedia data to a technology. (shrink)

ObjectiveThe use of nanotechnologies is important to reduce environmental health problems in Iran, so the present study was conducted to determine the effectiveness of nanotechnologies in environmental health. This is a cross-sectional descriptive study for 11-year periods (2008–2018) on all articles published in three specialized journals of environmental health with emphasis on the use of nanotechnologies in various fields of environmental health (water, air, sewage, waste, food, radiation, etc).ResultsIn this study, 774 articles related to 114 issues of 3 specialized environmental (...) health journals were reviewed. A review of 774 articles showed that 80 articles (10.3%) were published in the field of nanotechnologies. Out of 80 articles published in the field of nanotechnology, 66 articles (82.5%) were published on the subject of water, 9 articles (11.3%) on wastewater and 5 articles (6.2%) on air pollution. Subject review of articles showed that articles using carbon nanotubes to remove natural organic pollutants, surfactants, hydroxybenzenes, phenol, dimethyl phthalates, use of titanium dioxide nanoparticles, iron-magnesium nanoparticles for wastewater treatment, Silver nanoparticles were used to remove air pollution. The results showed that published articles on nanotechnology in the field of environmental health were few. (shrink)

Nowadays, some of the things that are ḥarāmto be consumed, such as lard, its derivatives and alcohol are used as additives or additional nutrients in products, namely food and cosmetics that people use widely in daily life. The provision of these products, which are accepted as najis(impure), stands in front of us as one of the actual fiqh problems. In order to produce an accurate solution in this regard, the reaction condition and the level of dissolution in the product must (...) be determined. In this article, the level of mutanajjis (contamination) of the products that najisthings transforms through istihlāk(physical change) and the provision (hukm) of benefits from such things are examined. The research covers the discussions in the classical period regarding the provision of things, which included najāsah(impurity) and underwent physical change as well as the evaluations of contemporary Islamic jurists. The aim of this study is to contribute to the researches, which will be carried out to determine the provision of products containing ḥarāmelements. As the production is carried out on an industrial scale, such studies are important today in terms of the establishment of “ḥalāl” sensitivity and meeting the needs of people who have this sensitivity to learn the provision of such products.SummaryNowadays, in various sectors, especially food, feed, cosmetics, health and clothing industries, for the purposes of reducing the cost of the product, extending the shelf life, making the product more attractive in terms of color, consistency and aroma, many substances are added to the main material. The fact that some of the substances added are ḥarām(forbidden) such as blood, lard, pest, and ethyl alcohol require the subject to be considered in terms of fiqh. It is important to clarify two issues in order to reach a healthy result in the studies aiming to determine the provision (ḥukm) of the products that are mixed with najis(impure) substance. One of them is the determination of the level of istihlāk(physical change) in the mutanajjis(contamination) things. The second is the determination of the basic principles to be used in determining the provision of the things which najāsahhas undergone the physical change in. In this study conducted within the scope of this purpose and method, the hadīthsrelated to two different issues that are directly related to the subject have been evaluated as the basic textual basis. These are narrations about the cleanliness and pollution status of the contaminated water, and about the availability of fats and oils, which the dead mouse is seen in. It is stated in the narrations about the condition of the water that najāsah involved in, the water will not be najisunless its smell, taste or color changes because of the falling najāsahin it. According to this hadith, which shows the change of description as a measure, the fuqahāʾ(jurists) came to a consensus on the fact that water, which one of its characteristics changed because of najāsahwould be considered mutanajjis. When thishadithis evaluated together with the narrations that indicate the small amount of water is contaminated because of najāsah, in fact, it is seen that while the water is considered to be clean-najis, the situation of the water being affected from najāsahis taken as the basis and aimed to protect human health against the dirty water. At the time when there were not any one of today's microbiological analysis laboratories, the way to understand the pollution status of water was to see if the smell, color and taste of the water changed while taking the amount of the water into account. Since the rate of foreign matter in the water, the level of pollution and the health status of the water can be determined correctly in the laboratory today, operating the modern techniques as well as the measure of qualification change will be appropriate for the purpose of the hadīthsmentioned.In the narrations about the state of the fat, which the dead mouse is found in, it is seen that different operations are requested depending on the fat being solid or liquid. If the fat is liquid, different instructions have been made such as its being poured or used in lighting. Mālikīs, Shāfiʿīs, and Ḥanbalīfaqīhs (jurists) of the first period have ruled that liquids such as vinegar, milk and honey are mutanajjis, whether they are in little quantity or not, and whether their descriptions are changed or not, claiming that the amount of oil and the degree of impact on the dirt is not declared in the hadīths. The Ḥanafīs adopted the provision in the narrations mentioned pointing to a small amount of liquid oil and considered the measure of description change for a large amount of liquid valid. Ẓāhirīs, Ibn Taymiyyah and some of the faqīhsargued that the liquids which one cannot feel the color, taste or smell of the najāsahin are clean, regardless of the amount.These three approaches are open to criticism because the first is limited only to the literal meaning in the narrations and neglects the aims, and the second ignored the non-water fluids’ ability to hide the descriptions of the substance added to them, and the third evaluates the mustahlak substance (that has undergone a physical change) as if it had been istiḥālah(chemically changed). When the narrations related to the subject are examined, it is understood that while the usage of the liquid fat which the dead mouse was seen in as the food was prohibited, in fact, it was based on the foresight that all of the fat is affected by the mouse. It appears to have been ruled out that only the part polluted is the part affected by thenajāsahfor the fact that after the removal of the mouse and the environment from the solid oil exposed to the same contamination, the rest is allowed to be eaten. According to this, it is possible to say that the measure of mutanajjisin the things that affected by najāsahis in the degree of spreading of najāsah.Nowadays it is possible to determine the presence of najisthings in the main material, which is used as additive or addition, by the level of effect of these substances in the product, as well as by the assays. If the najissubstances used for purposes such as brightness, taste, consistency and extending shelf life, perform the expected functions, it means that they protect their presence in the product effectively. In fact, it should be acknowledged that these substances continue to exist effectively in the product, if they perform the targeted function without any chemical change, even the ratio in the product is low or the color, taste and odor are eliminated during the mixture.The faqīhswhile differed in opinion about the mutanajjisof things that the najāsahhad undergone physical changes in, they, in concert, considered the substances, which were not cleaned or could not be cleansed from which that they accept as mutanajjisby their own measurements, khabīs(disgusting), and have accepted the people’s eating of them as ḥarām. Likewise, they did not allow such things to be used in any way touching the body, clothing and containers. They have evaluated the narrations, which requires the spilth the fat that the dead mouse was seen in, as the main basis in this issue. On the other hand, about the use of the mutanajjisthings outside the human consumption area and in such a way that the clothes and body would not be contaminated; the majority of thefaqīhs preferred the mubāḥ provision. They have put forth the narrations as the basis that recommends the usage of the liquid oil in which the mouse was fallen in lighting. These approaches of the fuqahāʾabout the effect of the istihlākon the provision of making use of the things that affected by najāsahare of worth as the basic principles on the subject. It is possible to say that it is not permissible to consume food products containing lard or pork gelatin, and the chicken that has been torn apart while being left in hot water in order to pluck its feathers, and the egg which becomes mutanajjisfor it is boiled up with thenajāsahon, and the using of cosmetic products containing lard when today’s industrial products are evaluated in accordance with these principles. If taken the general opinion that defends that the ethyl alcohol is najis as the basis, the carbonated soft drinks, which are added to alcohol, can also be evaluated in this context. (shrink)

While climate change mitigation remains indispensable, together with adaptation to such climate change as cannot be prevented, current slowness of progress towards attaining an international agreement on these matters has fostered suggestions about climate engineering, originally proposed as supplementary to adaptation and mitigation. These suggestions take the forms of Solar Radiation Management and Carbon Dioxide Removal. This paper discusses the ethics of researching and of deploying them. Solar Radiation Management ranges from harmless but inadequate measures such as making (...) roofs reflect sunlight to ambitious ones such as projecting sulphate aerosols into the stratosphere to reduce incoming radiation. Some favor this measure as a quick and inexpensive replacement for mitigation; but its possible side-effects and lack of an exit-strategy mean that its deployment would be misguided, and that researching it might undermine determination to reach a mitigation agreement. Some forms of Carbon Dioxide Removal face similar objections, but others, like afforestation and Carbon Capture and Storage, comprise acceptable enhancements of current technology. Even if they do not buy time, these measures could beneficially supplement a global Climate Change agreement. (shrink)

Este trabajo surge a partir de la investigación general de las técnicas hidropónicas teniendo en cuenta sus ventajas y desventajas para de esta forma poder encontrar aquel factor determinante a través de una comparación de técnicas hidropónicas que permitan clasificarlas y escoger la mejor opción que genere menos impacto ambiental negativo y demuestre ser más productivo en los entornos urbanos. Adicionalmente, un factor determinante en las ciudades es su espacio limitado por lo que la mejor opción también deberá incluir un (...) óptimo manejo del espacio que permita a casi cualquier individuo poder aplicarlos desde su entorno sin recurrir a excesivas modificaciones. Como principal resultado se escogió a la Hidroponía recirculante como método predominante por los excelentes resultados que se obtienen con relación a los demás, adicionalmente, este puede ser fácilmente aplicado en los ambientes urbanos por su versatilidad y buen manejo de recursos. Palabras Clave: Hidroponia, ambiente, urbano, comparativa, técnicas, cultivo. Referencias [1]J. López, «La producción hidropónica de cultivos,» IDESIA, vol. 36, nº 2, pp. 139-141, 2018. [2]J. Lee, A. Rahman, J. Behrens, C. Brennan, B. Ham, H. Seok Kim, C. Won, S. Yun, H. Azam y M. Kwon, «Nutrient removal from hydroponic wastewater by a microbial consortium,» New Biotechnology, vol. 41, pp. 15-24, 2018. [3]H. Ku, C. Tiong, A. Suresh y B. Ong, «“Active” hydroponic greenhouse system to kick-start and augment reforestation program through carbon sequestration e an experimental and theoretical feasibility study,» Journal of Cleaner Production, vol. 129, pp. 637-646, 2016. [4]J. Beltrano y D. Gimenez, Cultivo en hidroponía, Buenos Aires: Universidad de la Plata, 2015. [5]L. Ramírez, M. Pérez, P. Jiménez, H. Giraldo y E. Gómez, «Evaluación preliminar de sistemas acuapónicos e hidropónicos en cama flotante para el cultivo de orégano,» Revista Facultad de Ciencias Básicas, vol. 7, nº 2, pp. 242-259, 2011. [6]S. Hosseinzadeh, D. Testai, M. BKheet y J. De Graeve, «Degradation of root exudates in closed hydroponic systems using UV/H2O2: Kinetic investigation, reaction pathways and cost analysis,» Science of the Total Environment, vol. 1, pp. 1-9, 2019. [7]N. Camarena, A. Rojas y M. Santos, «Fluoride bioaccumulation by hydroponic cultures of camellia,» Chemosphere, vol. 136, pp. 56-62, 2015. [8]W. Wang, Y. Ma, L. Fu, Y. Cui y M. Yaqoob, «Physical an mechanical properties of hydroponic lettuce for automatic harvesting,» Informatión processing in agriculture, vol. 1, pp. 2214-3173, 2020. [9]M. Zárate, Manual de Hidroponia, Coyoacán: Universidad Autónoma de Mexico, 2014. [10]S. Magwaza, L. Magwaza, A. Odindo y C. Buckley, «Partially treated domestic wastewater as a nutrient source for tomatoes grown in a hydroponic system: effect on nutrientabsorption and yield,» Heliyon, vol. 6, nº 12, pp. 2405-8440, 2020. [11]C. ARANO, «Hidroponía: Algunas paginas de historia,» Tecnología de Producción, nº 58, pp. 24-32, 2007. [12]G. Guzmán, Hidroponia en Casa: Una actividad familiar, Costa Rica: Ministerio de Agricultura y ganaderia, 2004. [13]J. Gilsanz, HIDROPONIA, Montevideo : Unidad de Comunicación y Transferencia de Tecnología, 2007. [14]C. Miller, «El debate de hidroponia orgánica: Perspectivas norteamericanas sobre si la producción hidropónica merece ser certificada como orgánica.,» Productores de Hortalizas, nº 6, pp. 36-38, 2017. [15]A. Herrera, «Manejo de la solución nutritiva en la producción de tomate en hidroponía,» Terra Latinoamericana, vol. 17, nº 3, pp. 221-229, 1999. [16]C. Espinal y D. Matulić, «Recirculating Aquaculture Technologies,» Biomedical and Life Sciences, pp. 35-76, 2020. [17]H. Resh, «Técnicas de cultivo con flujo laminar de nutrientes,» de Cultivos Hidroponicos, España, Mundi-Prensa, 2001, pp. 35-37. [18]P. Blanca y L. Teresa, «Sistemas recirculantes y su interés en el cutlivo de ornamentales,» Tecnología de producción, nº 35, pp. 34-36, 2006. [19]C. Magán, «Recirculación de las soluciones nutritivas, Manejo y Control Microbiologico,» InfoAgro, nº 2, pp. 1-2, 2016. [20]S. Goddek, A. Joyce, B. Kotzen y M. Dos-Santos, «Aquaponics and Global Food Challenges,» Aquaponics Food Production Systems. Springer, vol. 1, nº 1, pp. 3-17, 2019. [21]S. G. Verdoliva, D. Gwyn Jones, A. Detheridge y P. Robson, «Controlled comparisons between soil and hydroponic systems reveal increased water use efficiency and higher lycopene and β-carotene contents in hydroponically grown tomatoes,» Scientia Horticulturae, pp. 3002-4238, 2020. [22]A. Chaudhry y V. Mishra, «A Comparative Analysis of Vertical Agriculture Systems in Residential Apartments, » de 2019 Advances in Science and Engineering Technology International Conferences, Dubai, United Arab Emirates, United Arab Emirates, 2019. [23]T. Mazhar, G. Jianmin, L. Imran, S. Kashif, Q. Waqar, S. Sher y C. Jiedong, «Modern plant cultivation technologies in agriculture under controlled nvironment: a review on aeroponics,» Journal of Plant Interactions, vol. 13, nº 1, pp. 338-352, 2012. [24]K. Janiak, A. Jurga, J. Kuźma, W. Breś y M. Muszyński, «Surfactants effect on aeroponics and important mass balances of regenerative life support system – Lettuce case study,» Science of the Total Environment, vol. 718, nº137324, pp. 1-12, 2020. [25]F. Rahman, I. Jahan, R. Biplob, N. Farhin y J. Uddin, «Automated Aeroponics System for Indoor Farming using Arduino,» de 2018 Joint 7th International Conference on Informatics, Electronics & Vision and 2018 2nd International Conference on Imaging, Vision & Pattern Recognition, Kitakyushu, Japan, 2018. [26]M. Caldeyro Stajano, «La Hidroponía Simplificada como Tecnología apropiada, para implementar la Seguridad Alimentaria en la Agricultura Urbana.,» Cuadernos del CEAgro, nº 8, pp. 71-76, 2006. (shrink)

Environmental landscaping is known to build, plan, and manage landscapes that consider the ecology of a site and produce gardens that benefit both people and the rest of the ecosystem. Landscaping and the environment are combined in landscape design planning to provide holistic answers to complex issues. Seeding native species and eradicating alien species are just a few ways humans influence the region’s ecosystem. Landscape architecture is the design of landscapes, urban areas, or gardens and their modification. It comprises the (...) construction of urban and rural landscapes via coordinating the creation and management of open spaces and economics, finding a job, and working within a confined project budget. There was a lot of discussion about global warming and water shortages. There is a lot of hope to be found even in the face of seemingly insurmountable obstacles. AI is becoming more significant in many urban landscape planning and design elements with the advent of web 4.0 and Human-Centred computing. It created a virtual reality-based landscape to create deep neural networks (DNNs) to make deep learning (DL) more user-friendly and efficient. Users may only manipulate physical items in this environment to manually construct neural networks. These setups are automatically converted into a model, and the real-time testing set is reported and aware of the DNN models that users are producing. This research presents a novel strategy for combining DL-DNN with landscape architecture, providing a long-term solution to the problem of environmental pollution. Carbon dioxide levels are constantly checked when green plants are in and around the house. Plants, on either hand, remove toxins from the air, making it easier to maintain a healthy environment. Human-centered Artificial Intelligence-based web 4.0 may be used to assess and evaluate the data model. The study findings can be sent back into the design process for further modification and optimization. (shrink)

Within the last decade, several approaches using quaternion numbers to handle and model multiband images in a holistic manner were introduced. The quaternion Fourier transform can be efficiently used to model texture in multidimensional data such as color images. For practical application, multispectral satellite data appear as a primary source for measuring past trends and monitoring changes in forest carbon stocks. In this work, we propose a texture-color descriptor based on the quaternion Fourier transform to extract relevant information from (...) multiband satellite images. We propose a new multiband image texture model extraction, called FOTO++, in order to address biomass estimation issues. The first stage consists in removing noise from the multispectral data while preserving the edges of canopies. Afterward, color texture descriptors are extracted thanks to a discrete form of the quaternion Fourier transform, and finally the support vector regression method is used to deduce biomass estimation from texture indices. Our texture features are modeled using a vector composed with the radial spectrum coming from the amplitude of the quaternion Fourier transform. We conduct several experiments in order to study the sensitivity of our model to acquisition parameters. We also assess its performance both on synthetic images and on real multispectral images of Cameroonian forest. The results show that our model is more robust to acquisition parameters than the classical Fourier Texture Ordination model. Our scheme is also more accurate for aboveground biomass estimation. We stress that a similar methodology could be implemented using quaternion wavelets. These results highlight the potential of the quaternion-based approach to study multispectral satellite images. (shrink)

Photo by Alex Guillaume on Unsplash Introduction The problem of climate change raises some important philosophical, existential questions. I propose a radical solution designed to provoke reflection on the role of humans in climate change. To push the theoretical limits of what measures people are willing to accept to combat it, an extreme population control tool is proposed: allowing people to reproduce only if they make a financial commitment guaranteeing a carbon-neutral upbringing. Solving the problem of climate change in (...) the long run by halting the procreation of human beings is controversial. In the absence of human beings and consequent climate change, other animals and plant species would benefit from an atmosphere more conducive to prolonging their existence and even improving their ability to thrive. If someone were to invent something to reverse the effects of climate change and improve animals’ lives, then human beings’ presence would be justified by the invention. Whether the propagation of the human species is beneficial to anyone or anything but human beings themselves is difficult to answer. Perhaps human beings are unfit to tackle this issue, being unable to judge it objectively. Managing Procreation: An alternative to Piecemeal Approaches Measures aimed at reducing greenhouse gases by nudging individuals and corporations may have a positive effect, but if their behavior is not climate neutral, they continue to contribute to climate change. Consequently, as long as the number of people increases, reducing greenhouse gases is at best a mitigation tool. If humans could rely solely on renewable energy, decreasing the population arguably would not be necessary. Significantly reducing the number of people appears to provide a solution to both problems: people who do not exist do not contribute to climate change, and renewable energy could meet the demand of a smaller population. One option is to let only those who produce the problem pay for its solution. One could determine the expected annual emission of greenhouse gases per person, assuming an average life expectancy, and calculate the costs to compensate them by, e.g., installing extra solar panels. Those expected costs could then be paid by the parents of each new person annually over the first eighteen years of that person’s life by dividing the total expected costs by eighteen. There are also practical difficulties. It would be difficult to determine the payment necessary. What should be done if a child has been born whose parents cannot afford to pay? In addition, child benefits could be canceled, contrary to recent incentives for child births instated in Italy,[1] where additional benefits will be made available to pay for childcare, and Hungary,[2] where women with four children or more will be exempted for life from paying income tax. A transition period could exist once the policy has been adopted, since it would be unreasonable to confront those who are already pregnant with costs they could not reasonably have expected. While the analysis is both hypothetical and theoretical, the impracticality is a noteworthy obstacle. There are several practical issues that cannot be addressed here, like the difficulty of calculating the added negative effects of each new individual and the unlikelihood that many citizens will support politicians who propose adopting policies that discourage having children. The upshot of what I have proposed is that climate change can be solved in the long run without financial costs to society as a whole, notwithstanding the transitional measures that would bring costs with them. Managing Procreation to Reduce Suffering Should this be deemed too harsh a stance, it is important to consider the basic issue of whether it is justified to introduce measures to reduce the number of people in an already overpopulated world, especially if climate change leads to additional suffering. One need not agree with Benatar, but his perspective must at least be taken seriously: It is curious that while good people go to great lengths to spare their children from suffering, few of them seem to notice that the one guaranteed way to prevent all the suffering of their children is not to bring those children into existence in the first place.[3] Benatar argues that non-existence is preferable to existence,[4] which raises the question why new people should be created at all. Those who question whether this planet will be habitable for future generations presuppose that such generations will exist. If people are not brought into existence, they may be said to be deprived of what life has to offer, but life must not be presupposed to be something positive. Whether this is the case in fact merits an inquiry of its own. A solution to the problem of climate change despite an increased population does not equate to a positive outcome since it merely means that something negative is removed. After all, solving the problem is not a means to an end, but a means to a means, the latter means being a means to a happy life, which does not automatically ensue from a solution to the problem. Benatar, as an anti-natalist, argues that procreation is morally wrong. His basic idea is that there is an asymmetry between pleasure and pain and that the pleasure that is not experienced by someone because that person does not exist is not something bad whereas the absence of pain that is not experienced – for the same reason – is something good.[5] Accordingly, “The reason why we do not lament our failure to bring somebody into existence is because absent pleasures are not bad.”[6] One may question whether such a perspective suffices to prove that coming into existence is always a harm, but the assertion that coming into existence exposes a new being to potential harm is clear. Objections A drawback of the proposed radical solution, placing the financial impediment on procreation, is that it will not solve climate change in the short run. A significant drop in the number of people may have a positive effect in the long run, but for now the behavior of the people in existence is the problem. Other climate change mitigation policies would necessarily continue. Additionally, there are important practical reasons to continue to procreate. The benefits for the elderly are paid for by the labor force. It is a problem that new generations are created as mere means to benefit older people. Perhaps more troubling, a pyramid scheme is created: by the time those people have themselves become old, a new labor force must have been brought into existence, a process that must presumably continue. If a consideration for people in developing countries to have children is that they cannot provide for themselves at an advanced age, while benefits are either lacking or insufficient, developed countries could collectively fund a pension scheme.[7] This may be low-cost if it is tailored to the living standard in the countries in question and given the life expectancy. Such a pension scheme should be predicated on the countries’ efforts in reducing the birth rate. If the labor force decreases, the economy may suffer. The focus on economic growth is arguably one of the causes of climate change, but if the number of people is reduced, the living standard does not have to be compromised, since the economy can then still grow. If fewer people began to use natural resources and nonrenewable energy at higher per capita rates, then the procreation might not be beneficial to the climate. It would need to be accompanied by regulations on use. One may also object that only wealthy people will be able to afford children. This is correct, but there is no right to have a child one cannot afford. The right to procreate does not entail the right to have as many children as one wants.[8] Yet in many countries, like the United States, it is a fundamental right that is constitutionally protected. There are numerous social, emotional, and even biological reasons why people choose to procreate. These may include the joy of having a family, the hope that children may bring in society, and the intergenerational transference of knowledge. People may have a strong desire to raise children or even a religious duty. If someone procures a sports car that is highly polluting, it would be justifiable to impose a tax in such a case. Many taxes and fines are imposed on corporate polluters. Procreation is significantly different but if the issue is regarded with some distance, then a climate change prevention tax could be appropriate. Some may argue that raising children is expensive already, which nonetheless does not deter people from having children. The tax I propose would be additional and specifically dedicated to carbon neutrality, but it would be difficult to predict whether it would discourage procreation. One last objection may be that for those now dedicated to sustainability for preserving the earth for the sake of future generations, there would be little or no incentive to continue any climate change mitigation efforts at all. If they sense they cannot afford to procreate, they may simply use every natural resource rather than save the earth for animals or for next generations. In a democracy, this problem does not exist if the majority can afford to procreate and agree with legislation on the basis of which such behavior is discouraged or punished. CONCLUSION Prior to their existence, there is no obligation to bequeath the earth to next generations. Such generations will only exist if they are actually created, and there is no obligation to create them. The lack of existence should not be confused with harm. Climate change provides an important reason to stem overpopulation. Ironically, fast rates of procreation may lead to the earth becoming uninhabitable for humans altogether. The radical solution that has been proposed here is an unrealistic scenario. For now, the average global birth rate is just over 18 per thousand people, but there is a need to ensure that the number of people is not greater than the planet can endure. While it is better to prevent problems than to solve them, the interest in procreation and its associated joys, usefulness, and cultural value make mass reduction in the population unlikely. Some countries have smaller average family size than others and can act as models for reducing population in a less radical way. The need to continue efforts to reduce climate change persists. Whether it would curb population growth or not, an additional financial burden applied to neutralizing each person’s offspring’s carbon footprint provides a meaningful thought exercise that could help alleviate the pressure on current climate mitigation strategies. [1] The Local Italy, How Italy’s new ‘Family Act’ aims to increase the plunging birthrate, https://www.thelocal.it/20200612/what-you-need-to-know-about-italys-new-family-act/. [2] BBC, Hungary tries for baby boom with tax breaks and loan forgiveness, https://www.bbc.com/news/world-europe-47192612. [3] David Benatar, Better never to have been, 6. [4] David Benatar, Better never to have been, 44, 58. [5] David Benatar, Better never to have been, 14, 30, 38. [6] David Benatar, Better never to have been, 35. [7] Alastair Leithead, “Can Niger break out of its cycle of poverty?”, https://www.bbc.com/news/world-africa-41018081; Sebastien Malo, “Fewer children, fewer climate risks? Niger ponders a controversial option”, https://www.reuters.com/article/us-niger-climate-change-familyplanning-idUSKBN1WM11E. [8] Sarah Conly, “The Right to Procreation: Merits and Limits,” American Philosophical Quarterly 42, no. 2 : 105-115, 105, 106. (shrink)

In The Flesh of Images, Mauro Carbone analyzed Merleau-Ponty's interest in film as it relates to his aesthetic theory. Philosophy-Screens broadens the work undertaken in this earlier book, looking at the ideas of other twentieth-century thinkers concerning the relationship between philosophy and film, and also extending that analysis to address the wider proliferation of screens in the twenty-first century. In the first part of the book, Carbone examines the ways that Sartre, Merleau-Ponty, Lyotard, and Deleuze grappled with the philosophical significance (...) of cinema as a novel aesthetic medium unfolding in the twentieth century. He then considers the significance of this philosophical framework for understanding the digital revolution, in particular the extent to we are increasingly and comprehensively connected with screens. Smart phones, tablets, and computers have become a primary referential optical apparatus for everyday life in ways that influence the experience not only of seeing but also of thinking and desiring. Carbone's Philosophy-Screens follows Deleuze's call for "a philosophy-cinema" that can account for these fundamental changes in perception and aesthetic production, and adapts it to twenty-first century concerns. (shrink)

Highlights Merleau-Ponty’s interest in film and connects it to his aesthetic theory.

The time of half-sleep : Merleau-Ponty between Husserl and Proust -- Ad limina philosophiae : Merleau-Ponty and the "introduction" to Hegel's Phenomenology of spirit -- Nature : variations on the theme -- The thinking of the sensible.

We analyse the structure of propositional proofs in the sequent calculus focusing on the well-known procedures of Interpolation and Cut Elimination. We are motivated in part by the desire to understand why a tautology might be ‘hard to prove’. Given a proof we associate to it a logical graph tracing the flow of formulas in it . We show some general facts about logical graphs such as acyclicity of cut-free proofs and acyclicity of contraction-free proofs , and we give a (...) proof of a strengthened version of the Craig Interpolation Theorem based on flows of formulas. We show that tautologies having minimal interpolants of non-linear size must have proofs with certain precise structural properties. We then show that given a proof Π and a cut-free form Π′ associated to it , certain subgraphs of Π′ which are logical graphs correspond to subgraphs of Π which are logical graphs for the same sequent. This locality property of cut elimination leads to new results on the complexity of interpolants, which cannot follow from the known constructions proving the Craig Interpolation Theorem. (shrink)

The ability to read emotions in faces helps humans efficiently assess social situations. We tested how this ability is affected by aspects of familiarization with face masks and personality, with a focus on emotional intelligence. To address aspects of the current pandemic situation, we used photos of not only faces per se but also of faces that were partially covered with face masks. The sample, the size of which was determined by an a priori power test, was recruited in Germany (...) and consisted of healthy individuals of different ages [M = 24.8 years]. Participants assessed the emotional expressions displayed by six different faces determined by a 2 × 3 design. Each person was presented with six different emotional displays with or without a face mask. Accuracy and confidence were lower with masks—in particular for the emotion disgust but also for happiness, anger, and sadness. When comparing the present data collected in July 2021 with data from a different sample collected in May 2020, when people first started to familiarize themselves with face masks in Western countries during the first wave of the COVID-19 pandemic, we did not detect an improvement in performance. There were no effects of participants’ emotional intelligence, sex, or age regarding their accuracy in assessing emotional states in faces for unmasked or masked faces. (shrink)

Philosophical interpretation of Proust based on the work of Merleau-Ponty and Deleuze.

La recherche récente a régulièrement remis en cause la catégorie moderne de « lois sacrées » désignant des inscriptions grecques qui forment un ensemble mal défini. Cet article entend dépasser le corpus traditionnel des « lois sacrées » en présentant un projet de recueil alternatif de « Normes rituelles grecques » (CGRN pour l’acronyme anglais), qui s’appuie sur des critères plus sélectifs et sera publié en ligne.