How can we stop being dependent on fossil fuels? Peter Carlsson, the co-founder and CEO of Northvolt and previously Elon Musks right-hand man at Tesla, is a good person to ask. He helped launch the Tesla Model S, and right now, his Swedish company’s on a mission to build the greenest battery in the world. Peter Carlsson talks about the importance of our ability to store energy and his ambitious plans for both his business and the planet.