Associated Press: President Barack Obama says the federal government will reduce its own greenhouse gas emissions by 28 percent in the next decade — an ambitious goal that exceeds targets for the country as a whole. As the single largest energy consumer in the U.S. economy, Obama says the government spent more than $24.5 billion on electricity and fuel in 2008 alone. He says achieving the new pollution goal would cut federal energy use by the equivalent of 205 million barrels of oil, the same as …