Global electricity demand is up by more than 6 percent, the largest increase since 2010. The demands were in large part due to strong economic growth, plus colder winters and hotter summers linked to climate change. As energy needs go up, how can cleaner sources take a bigger role? Donnel Baird is the founder of BlocPower, a start-up in New York is trying to make solar panels and clean heating available to everyone, including low-income neighborhoods. Amy Knowles is the chief sustainability officer for the city of Miami Beach.