Agence France-Presse: China confirmed Thursday that it will demand rich nations cut greenhouse gas emissions by 40 percent from 1990 levels by 2020 in upcoming global climate change negotiations. In a position paper published for negotiations to be held in Copenhagen in December, China – one of the world’s largest emitters of greenhouse gases that cause global warming – did not commit to any legally binding reductions. “Developed countries shall undertake to reduce their GHG (greenhouse gas) …