
LIMA, Peru—Divisions among governments about how to deal with global warming pushed the United Nations Climate Change Conference, known as COP20, nearly two days past its deadline. But the agreement approved in the Peruvian capital in the early hours of Dec. 14 was groundbreaking in that all of the 196 participating nations promised to formulate a plan to reduce their greenhouse gas emissions. After two decades of negotiations in which developed nations were expected to cut their emissions while the rest got a free pass, that shared commitment is an important step. But it remains to be seen what each […]