You need some citations on China's pollution controls for their coal plants. Fact is their plants are a far sight better than ours: http://pubs.acs.org/doi/abs/10.1021/es1025678
As for the mercury thing... oh joy.
The mercury released by coal plants, which is raw metallic mercury, will bioaccumulate... (that's a fancy word meaning ti stays in the body.) Thiomersal does not bioaccumulate, so it does not work its way up the food chain once it's released into the environment, becoming more and more concentrated, until it gets to your dinner plate. It is the accumulation of mercury in the food chain that is the danger.
To imply thiomersal is toxic just because it has a mercury atom in it's constituent molecule is like saying table salt is deadly poison because it contains chlorine. You're basically saying nobody has the right to complain about clouds of chlorine gas because they own saltshakers. Chemistry does not work that way.
Well I guess they have to have something for all those Scruberless Coal Plants to run, that they were building at the rate of 2 per week. (Same kind of issue with Mexico, where "Clean" San Diego is getting its juice now that Nuclear Basket Case San Onofre is down for the count, and likewise India).
Its a tongue biting issue for me since we have plenty of very very clean Coal plants here which recover 99% of the sulfur dioxide and 90% of the Mercury (which is used mostly for vaccine preservative these days) that are shut down due to excessive "carbon taxes", but china builds hundreds of Coal Fired plants with absolutely horrible pollution controls (if any). But then thats the least of their problems because they have Rivers and Streams regularly "Catching Fire", burning off the industrial pollution.
People used to come to my door petitioning against the Mercury being released by US Coal Plants. Where I live, the pollution mainly comes from less strict emission Nanticoke plants (West of me in Ontario Canada).
I didn't sign since I don't see worrying about a trace amount of Mercury that might be released to the air, when the same petitioners have absolutely no problem injecting it full strength directly into their veins.