Clock is Ticking, Slowly, on Rules for Coal-fired Power Plants

 POOLESVILLE, Md. — On a curve of the Potomac River 37 miles northwest of Washington, the Dickerson power plant has stood sentry over small villages, crop fields and horse farms for more than half a century.Burning mostly coal and some natural gas, Dickerson emitted about 1.5 million tons of greenhouse gases in 2011, akin to the pollution of about 275,000 cars.How much longer Dickerson ...