The world has 1.3 billion vehicles and perhaps 1.5 billion households. Cutting emissions from these cars and homes means changing the daily lives of billions of people, a mind-boggling thought. Reducing global coal emissions, by contrast, means dealing with 3,300 big coal-fired power plants and several thousand big coal-driven steel and cement factories.*10 The task is huge, but it is at least imaginable—and it targets almost half of the world’s emissions at a stroke.
