, the biofuel made from corn and other plant materials, was once acclaimed as the solution to the United States' dependence on foreign oil. Yet growing evidence, including a recent study from the University of Michigan
, shows how the fuel is not reducing CO2 emissions
as previously thought, but is instead contributing to the environmental demise of the American Great Plains
, a region in the country's Midwest, as well as its waterways and estuaries, polluted by the chemical fertilisers and pesticides used for corn production.