If we educate and empower girls and young women, they are likely to have more control over their fertility. And with fewer people on the planet, it becomes the number one climate change solution. But it’s more complicated than it sounds, and not without controversy. Experts: Christina Kwauk, a fellow in the Center for Universal Education at Brookings, and Paul Hawken, founder of Project Drawdown Reporter: Ashley Lime Producer: Jordan Dunbar Researcher: Eleanor Biggs Editor: Ravin Sampat Sound mixer: Tom Brignell