Climate Central: The U.S., Mexico and Canada are expected to pledge Wednesday to collectively generate 50 percent of their electricity from zero-carbon sources by 2025, according to White House officials.
The agreement is expected to be struck at the North American Leaders' Summit in Ottawa. It means that when all the electricity generated in the three countries is added up, the amount coming from zero-carbon sources will jump from 37 percent today to half within 10 years. Zero-carbon sources include solar, wind,...