New York Times: Wind could replace coal and natural gas for 20 to 30 percent of the electricity used in the eastern two-thirds of the United States by 2024, according to a study released Wednesday by the Energy Department. But doing so would require a reorganization of the power grid and a significant increase in costs. And it would have only a modest impact on cutting emissions linked to global warming, the study found. The Energy Department under President Obama has been a proponent of …