Let's assume that the agreement between the U.S. and China that was announced last November will be implemented fully, even though the Chinese effectively disavowed it almost immediately, and did so smack dab in the middle of the 20th Conference of the Parties in Lima, Peru. That agreement calls for an additional 10 percent reduction by the U.S. by 2025, with no actual reduction by the Chinese; this additional cut in U.S. emissions gets us another temperature reduction of one one-hundredth of a degree.