The German farmer who's keeping his village warm
Locally produced biogas could help reduce Germany's dependence on natural gas imports. So why doesn't it play a bigger role? German farmer Henning Varnholt knows all the stumbling blocks. He's been producing biogas since 2009 despite criticism from neighbors. Today, he and his community are self-sufficient and the critics have fallen silent. But is biogas really all it's cracked up to be?