Sterman calculated that the United States pulling out of the Paris Agreement, and canceling many Obama-era climate regulations, including the Clean Power Plan, would increase global temperatures on the order of a few tenths of a degree by 2100. That assumes, however, the rest of the world keeps making aggressive cuts. "Assuming that all nations, including the US, aggressively cut emissions, would yield 1.9 degrees Celsius [of warming] by 2100," he said. "But if the US does nothing, then expected warming rises to 2.2 degrees Celsius by 2100."