With the dangers of nuclear power playing out in Japan, fighting in Libya pushing oil prices up, and climate scientists pointing an accusing finger at coal, America is desperate for some energy alternatives. One that seemed promising is natural gas - a relatively clean burning fuel. But critics now say the process of getting gas from the ground may be risky. If you saw the documentary, Gasland, there’s one scene you’ll never forget. A guy from Weld County, Colorado - where gas wells are common - turns on his tap, flicks his lighter and jumps back as the water bursts into flame.