The Nobel Prize-winning physicist Steven Chu is stepping down as Energy Secretary. For four years, he was the guru of keeping America's lights on, keeping the factories chugging, and deciding how we should do both well into the future. And he wanted more solar power.
With the rest of Washington perennially obsessed with fossil fuels, Chu was concerned above all else with securing the nation an affordable, sustainable, and abundant supply of clean energy. As a scientist, Chu recognized the threats posed by climate change, and believed the threat should be addressed.