Last week the concentration of carbon dioxide in the atmosphere was reported to have passed 400 parts per million for the first time in 4.5m years. It is also continuing to rise at a rate of about 2 parts per million every year. On the present course, it could be 800 parts per million by the end of the century. Thus, all the discussions of mitigating the risks of catastrophic climate change have turned out to be empty words.
据报道，上周，大气中的二氧化碳浓度超过400ppm，这是450万年来的第一次。二氧化碳浓度还在继续以每年约2ppm的速度升高。根据目前的趋势，到本世纪末，二氧化碳浓度可能会达到800ppm。也就是说，事实证明，所有那些有关减轻灾难性气候变化风险的讨论都是空话。
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