The Great Lakes hold quadrillions of gallons of water. Is allowing one more company to take water from them such a big deal?

Yes, say groups worried about the slippery slope of Great Lakes' diversions.

A controversial plan to divert 7 million gallons of water a day from Lake Michigan to the proposed site of a factory in Wisconsin, run by Foxconn, an international manufacturer of electronics, was upheld by an administrative law judge earlier last month.