Reuters: More than 110 countries have signed up to the Copenhagen Accord on fighting global warming but the United Nations said on Wednesday that their pledges for cutting greenhouse gas emissions were insufficient. The first formal U.N. list of backers of the deal, compiled since the text was agreed at an acrimonious 194-nation summit in December, showed support from all top emitters led by China, the United States, the European Union, Russia, India and Japan. It also includes smaller …