Last I heard, China passed the USA as the world's #1 emitter of so-called "greenhouse gases" three years ago, and currently emits 27% of the world's atmospheric pollution. At the present rate of increase, China will ADD as much pollution each year as the total emitted by Japan, and every three years the annual total from the USA.
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They may talk about reducing pollution, but talk is cheap; the fact remains that China and India, together, open a new coal-fired power station every 9 days, and are building, or plan to build, over 900 more before 2035. China, India, and emerging future economic giants and polluters like Brazil and Indonesia, were excempted from the Kyoto Treaty, which is one reason why George W. Bush refused to sign it; it was obviously aimed solely at western countries, especially the USA.
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This looks to evolve into a political debate, so maybe it should be moved into the appropriate section.