History has shown that a cap-and-trade system could effectively limit carbon dioxide emissions to an acceptable level - it was done with sulfur dioxide after it was shown that that gas produced acid rain. The question today is how serious governments are about controlling carbon dioxide, which is not such a clear-cut pollutant. After all, plants need CO2 to survive. And there are respected scientists who argue that man-made emissions are not the cause of rises in global temperatures.

But even if CO2 isn't making the planet warmer, there are still reasons to cap emissions. The explosion of car ownership and factory building in China means that more and more pollution is in the air - Chinese pollution is even making LA's air worse. And rich countries can help. An initial step would be ultra-extremists like the Bush administration admitting that maybe half a billion cars on the streets of China wouldn't be so good for global air quality.

www.chinaeconomicreview.com 

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