Washington Post: President Obama set specific greenhouse-gas emissions targets for the federal government Friday, saying it would aim to reduce its emissions by 28 percent by 2020. The executive order, which covers 35 government agencies that must submit plans to the Office of Management and Budget by June for meeting the target, takes aim at the nation’s single-largest energy consumer, although it represents a small fraction of total U.S. energy spending. The federal government spent more than …