Reuters: Top emitters of greenhouse gases tried on Monday to break a deadlock about sharing the burden of cuts in a U.N. climate pact, and Washington rejected charges that it was lagging Europe in fighting global warming. Environment ministers from 17 nations including the United States, China, Russia, Japan, Germany and France met for the first of two days of U.S.-led talks in Paris hoping to ease splits on emissions cuts, aid to the poor and new technologies. France told the meeting …