http://www.kqed.org/.stream/anon/radio/quest/2011/03/2011-03-28-quest.mp3
California is hungry for renewable energy. Solar and wind power have taken off thanks to the state's ambitious clean energy goals. But there's another way to generate electricity -- by using organic material like agricultural and tree waste. It's known as biomass power, but as Lauren Sommer reports, some say it's not as green as it seems.