Reuters: Rich nations should cut their greenhouse gas emissions by at least 40 percent by 2020 from 1990 levels as part of a new global climate change pact, China said on Thursday, spelling out its stance ahead of negotiations. The pact must ensure wealthy nations “take on quantified targets to drastically reduce emissions,” said the statement, issued by the National Development and Reform Commission (www.ndrc.gov.cn), which steers Chinese climate change policy. Developed countries …