Is China overly concerned about carbon tariffs?

Before the Fifteenth Conference of Parties (COP) in Copenhagen, carbon tariffs suddenly become a hot topic around the world. This is especially significant in the context of the global financial crisis. The passage of the US climate bill, the Clean Energy and Security Act (the Waxman-Markey Bill), on June 26, 2009, was a landmark event in terms of the carbon tariff debate. The Act contains an important provision, which requires the US President to levy a border adjustment (tax) on imports from certain countries from 2020 onwards without concurrently reducing emissions from the USA. The President must enforce this Act unless expressly permitted by Congress to disregard it.