Anyone who has looked seriously into China's environmental and energy-use emergencies ends up thinking, saying, or merely hoping that the US and China will work together urgently on these fronts. That would be good for China because it needs all the help it can get to avoid poisoning its own people. It would be good for America and everyone else because China's approach to carbon-emissions control will largely determine whether the world has any chance of dealing with climate problems.
Or to put things in a cheerier way, precisely because so many Chinese farms, factories, power plants, and buildings are now so inefficiently run*, there are more opportunities to make big environmental improvements here than practically anywhere else. (My contribution to this school of thought in this article.)
Everybody understands this point in the abstract. Now there's a useful new guide to what it might mean in very particular detail. For many months a scientific/technical task force run jointly by the Asia Society's Center on the US-China Relations and the Pew Center on Global Climate Change has worked on specific recommendations, which were unveiled last week. Press release is here; overview here; PDF of the report in English here; in Chinese here. Introductory video, with overview rather than specifics, below.