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You'll Become An Expert On: Fracking
Pennsylvanian Josh Fox received a letter in the mail offering him $100,000 in exchange for the right to frack (hydraulic fracturing) his land. Though energy companies continue to insist that fracking is a safe process, when Fox, moved by the proposed drilling on his land, toured the country, investigating fracking, he found "flammable, foul-smelling water, sick people and animals, and families who no longer use their wells but truck in all their household water."
When you came back from work and found your roommate trying to set his drinking water on fire, it was because of this film. If you're lucky, maybe he went out and signed a petition after.