Will the boom in natural gas drilling contaminate America's water supply? A  new boom in natural gas drilling, a process called "fracking", raises concerns about health and environmental risks. NOW talks with filmmaker Josh Fox about Gasland, his Sundance award-winning documentary on the surprising consequences of natural gas drilling. Fox's film—inspired when the gas company came to his hometown—alleges chronic illness, animal-killing toxic waste, disastrous explosions, and regulatory missteps.