Reuters: China urged rich nations on Wednesday to sign up to tougher 2020 targets to cut carbon emissions, as U.N.-led negotiations intensify on a broader climate pact meant to rein in the pace of global warming. An official with China’s National Development and Reform Commission (NDRC) said rich nations must commit to cutting emissions by 25-40 percent by 2020 as well as ramp up funding for developing countries. The comments come as Democrats in the U.S. House of Representatives neared …