気候工学 (ジオエンジニアリング) のレビュー

抄録

We review climate geoengineering, which is receiving increasing attention due to the slow progress of global climate policy and recognition of potential catastrophic effects of climate change. Climate engineering schemes are intended to modify part of the global climate system to countervail the effect of global climate change. There are two main categories of climate engineering options: carbon dioxide removal (CDR) such as ocean iron fertilization and CO₂ air capture; and solar radiation management (SRM) including stratospheric aerosol injection. SRM options are generally affordable, and timely in their effect, but come with side effects. CDR techniques tend to be costly and slow, but address ocean acidification as well as climate change. Terminating an SRM scheme would cause a rapid rise in global-mean temperature, whereas CDR does not pose such a problem. Both options entail significant uncertainties, which should be resolved through further research. Discussions on governance of climate engineering have already begun at various forums, mainly led by the United Kingdom and the United States.