Peter Kalmus is a climate scientist at NASA's Jet Propulsion Laboratory with a Ph.D. in physics from Columbia University. At work he studies the physics of clouds in a changing climate, and at home he explores how we can address climate change while living happier, more connected lives. He lives in Altadena, California, a suburb of Los Angeles, with his wife and two children on 1/10th the fossil fuels of the American average.