Reuters: Electric cars will not be dramatically cleaner than autos powered by fossil fuels until they rely less on electricity produced from conventional coal-fired power plants, scientists said on Monday. “For electric vehicles to become a major green alternative, the power fuel mix has to move away from coal, or cleaner coal technologies have to be developed,” said Jared Cohon, the chair of a National Research Council report released on Monday called “Hidden Costs of Energy: Unpriced …