Bloomberg: China, the world’s largest producer of greenhouse gases, and dozens of developing nations will be asked to consider accepting their first binding targets for reducing global-warming pollution. The cuts, to be made by 2050, are highlighted by the United Nations in a document guiding negotiations that start in six days in Bonn. The UN will supervise talks among 192 countries through December and is leading efforts to find common ground to stem climate change. The UN whittled down …