Agence France-Presse: The chief US climate negotiator said Wednesday he would go to China to press the rapidly growing economy to commit to hard numbers on emission reductions under the next treaty on global warming. In the midst of climate negotiations in Bonn, US climate envoy Todd Stern said he would head Saturday to Beijing in the belief that any future agreement must include strong action by China. Stern regretted that developing nations — which say rich countries bear historical …