Abstract

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.