Climate change is the greatest environmental threat of our time. In the United States, power plants represent the largest source of climate change pollution. President Barack Obama’s U.S. Environmental Protection Agency has proposed limiting that pollution with the Clean Power Plan — the most important step the U.S. government can take right now to combat climate change before it’s too late. This resource book from NRDC, the nation’s most effective environmental advocacy group, explains why the plan is needed and how it will benefit the United States while helping spur climate action around the world.