Although not an expert on Chinese pollution figures I would have a hard time believing that they didn't exceed the U.S. a long time ago. Our current administration might be secretive but it's nothing compared to China.

The Bush solution to Kyoto was not one of "It won't work so we're not going to buy into it". It was "There's no such thing as Global Warming!" Which was quickly followed by "We need to spend millions of dollars studying the problem" (without actually taking any measures whatsoever to reduce pollution which is bad for all of us anyway) to "Global warming is real (according to his own scientists) but we don't know if it's man made so we'll dump more money into studying it" again without taking any measures. Meanwhile he and his administration have overturned whole sections of law by meddling with enforcement, financially starving regulatory agencies, and planting administration sycophants in the organizations to stifle dissent from their eco-terrorist workers.

Besides the whole "won't work anyway" statement is obviously deranged. Their pollution might indeed increase to the point where our reductions are meaningless, but that doesn't mean we should just continue what we're doing.