Welcome to our first season of "The Big Switch." It's a five-part series that explores how the power grid works, how it's changing, and how those changes can benefit society. Your host is Dr. Melissa Lott of Columbia University's Center on Global Energy Policy. To slow climate change, we need to transform our buildings, our homes, cars, and the economy as quickly as possible. But how do we do it right?  Subscribe to "The Big Switch" everywhere you find podcasts.