China does not care about the pollution their coal fired power plants produce. There is one reason we should. Remember back in the fifties when Russia tested above ground nukes? Where did the fallout land? Here in Alaska and Canada thats where. Now where is all that smoke and particulates going to blow? Look at a weather chart sometimes and check out the prevailing winds. Look out Kalifornia, the ash is going to get deep. But not just along the coast, it will fall all over the country, just heavier in the west.
We here in the US use a lot of coal, but we use scrubbers and other devices to reduce or prevent pollution. Other countries don't, and won't do anything about pollution. Want a good example, Ankara Turkey, during the winter. Remember how China shut down all the plants and manufacturing in Beijing prior to the Olympics, just to do away with the smoke?