The hope is that the level of CO2 in the atmosphere can thus be kept below what is widely agreed to be the upper limit for a tolerable level of global warming, 450 parts per million.
人们希望，这样一来，大气中CO2的含量可以保持在百万分之450以下。人们普遍认为，这就可以让全球气候变暖的程度处在可容忍的上限以下。
The hope is that the level of CO2 in the atmosphere can thus be kept below what is widely agreed to be the upper limit for a tolerable level of global warming, 450 parts per million.
人们希望，这样一来，大气中CO2的含量可以保持在百万分之450以下。人们普遍认为，这就可以让全球气候变暖的程度处在可容忍的上限以下。
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