National Geographic: At the end of 2012, at a time when many states were replacing their aging coal plants, Arkansas switched on a new $1.8-billion coal plant, one of two the state has fired up in the past five years.
The state saw emissions from its power plants rise 35 percent between 2005 and 2012, even as other states turned to cleaner-burning natural gas and the nation's overall power plant emissions trended downward.
"We know we're a coal-heavy state," said Teresa Marks, director of the Arkansas Department...