The consequences of climate change—rising waters, extreme weather, record temperatures—are transforming our lives, as global warming accelerates more rapidly than scientists predicted even a few years ago. At the same time, the clean energy revolution is forging ahead faster than nearly anyone anticipated. As Tom Steyer sees it, these two trends together create a moment like the one America faced during World War II: on the one hand, an existential threat that demands our collective action; on the other, an opportunity to lead the world, protect the planet, and set the stage for a new generation of shared economic prosperity