Cap-And-Trade War?

Tyler Cowen really doesn't like the carbon emission tariffs in the Waxman bill:

[T]he current version of Waxman-Markey will make things worse.  Keep in mind by the time we are slapping those 2020 tariffs on China, we won't have made much progress on emissions ourselves.  How would we feel, and how would it influence our domestic politics, if the Chinese demanded we pass Waxman-Markey, while polluting at a high level themselves, or otherwise they will stop buying our Treasury securities?

–PA