Science, Technology, and Public Policy

The authors explore, in particular, the implications for CO2 removal and solar geoengineering of the Paris Agreement's long-term temperature goals, provision for "removals by sinks," and market-based mitigation mechanisms.

International climate negotiations are at an impasse because the world's two largest greenhouse gas (GHG) emitters, the United States and China, are unwilling to accept binding emission-reduction commitments. At the same time, each blames the other for its inaction. This paper proposes a global "deal" for breaking the deadlock in a way that reconciles both countries' economic concerns with the imperative of reducing emissions. The deal has two core elements: (1) All major emitting countries agree to reduce GHG emissions by implementing significant, mutually agreeable, domestic policies and (2) The largest industrialized-country emitters agree to establish a global Carbon Mitigation Fund that would finance the incremental cost of adopting low-carbon technologies in developing countries.