In 2008, Josh Fox received a letter that would change the course of his life and help bring attention to one of the more important issues in energy. That letter was from a gas drilling company, offering to lease his family's land in the Marcellus Shale in Pennsylvania. The lease would be for $100,000 to drill for natural gas. Fox wanted to help his family make an informed decision and did some research on natural gas drilling. What he found was so troubling that he started documenting his quest for answers. Over the course of a year and a half, he shot 200 hours of footage that he crafted into the 104-minute “Gasland,” a documentary about the effects of natural gas drilling, in particular the dangerous practice of fracking. The film has introduced the issue to millions of people and garnered him an Academy Award nomination for Best Documentary Feature in 2011. (Photo shows Fox, left, testing the flammability of drinking water at a home in Fort Lupton, Colo.)