But she added, “The question is whether it is in a position to talk about phasing coal out faster.” Despite its enormous economy and emissions, China tries to position itself as a defender of the developing world. For nearly two decades, China has been the biggest national emitter, but its average pollution per person is lower than in most wealthy countries, and Beijing has long maintained that those nations should shoulder a greater burden in cutting greenhouse gases and financing global action. Mr. Xie and other officials are likely to…