A plume of steam billows from the coal-fired Merrimack Station in Bow, N.H., on Jan. 20, 2015. The Obama administration's hotly debated plan to cut the amount of heat-trapping carbon dioxide coming out of the nation’s power plants will save about 3,500 lives a year from also reducing other types of pollutions, a new independent study concludes. (Associated Press) **FILE**
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