The rapid increase in ethanol plants under construction or planned for eight key farm states is threatening to pull billions of gallons of water each year from an aquifer that is already depleted and under stress, according to a new report issued Thursday by Environmental Defense. One of the world's largest aquifers, the Ogallala Aquifer, also known as the High Plains Aquifer, is a vast, shallow underground pool of water located beneath portions of Colorado, Kansas, Nebraska, New Mexico, Nebraska, Oklahoma, South Dakota, Texas, and Wyoming.The Ogallala Aquifer supports the majority of irrigated agriculture in the southern Great Plains. But the water table is declining in areas where rates of groundwater pumping have far exceeded rates of replacement. The report warns that water withdrawals for growing corn and processing it to make ethanol fuel will put unsustainable pressure on the aquifer. 

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