Reuters: Japan has stuck to its offer to cut greenhouse gas emissions by 25 percent by 2020 for a U.N. accord on condition major emitters agree on an ambitious climate deal, a statement from the foreign ministry showed on Tuesday. The target, based on 1990 levels, was submitted on Tuesday to the U.N. Climate Change Secretariat under a climate accord worked out by major emitters led by China and the United States last month in Copenhagen. The accord said rich nations should submit by …