On April 14, the National Science Board released a draft report called “Building a Sustainable Energy Future,” offering advice on how the United States can transition to renewable and clean sources of energy. Dan Arvizu, the cochairman of the board’s task force on sustainable energy and director of the National Renewable Energy Laboratory in Golden, Colo., recently talked with staff writer Laura Sanders about U.S. energy policy. Only about 7 percent of the nation’s energy comes from renewable sources. How urgent is it that we increase that? We really need to be moving very quickly... (p. 32)