Chinese carbon market doldrums may undermine climate efforts

By Kathy Chen and David Stanway BEIJING (Reuters) - Regulatory uncertainty and a lack of transparency have left trade on China's seven pilot carbon exchanges in the doldrums, which could undermine efforts to cut the nation's greenhouse gas emissions. China told the United Nations on Tuesday it would cap its emissions by 2030, and promised to cut carbon intensity - the amount produced per unit of economic growth - by 60-65 percent from 2005 levels by then as well. China told the U.N. it would bui