United Press International: China's top climate change negotiator has urged richer nations to help developing countries cut their emissions, as they had pledged to do in 2009. Xie Zhenhua, deputy head of China's National Development and Reform Commission, was referring to the 2009 U.N. summit in Copenhagen in which developed nations pledged $100 billion a year by 2020 to help fight climate change. Although a specific date for donor pledges to begin has still not been decided, developing countries have already contributed...