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An in-depth investigation has revealed that a key Obama administration environmental policy is actually harming the environment, causing large amounts of toxic nitrogen fertilizer to seep into water supplies.

The Associated Press’s investigation into the federal ethanol mandate found that not only is it not living up to its expectations, but the policy is also causing widespread environmental degradation and harming drinking water.

On the other hand, oil and natural gas exploration using hydraulic fracturing, or fracking, is not damaging water quality. The Environmental Protection Agency has failed on three separate occasions to link fracking to drinking water contamination, and an Energy Department study said fracking is safe when done within regulatory constraints.