EcoWatch: Since fracking began its boom period in the last decade, its supporters have promoted it as the answer to all of the U.S.s energy issues. It would free us from dependence on foreign oil, they said, thereby strengthening national security. And in fact, the U.S. has become the worlds largest exporter of fossil fuels, while prices at the gas pump have dropped steeply as fracked oil and gas production has exploded. States like Texas, Colorado, North Dakota, Pennsylvania and Ohio have welcomed frackers...