Because the effects of atmospheric carbon take years to show up as higher temperatures, limiting concentration to 450 ppm requires halting emissions at current levels.
因为大气碳含量增加表现在气候变化上要经过几年的时间，把它限制在450ppm的水平上需要我们现在就终止排放。
Because the effects of atmospheric carbon take years to show up as higher temperatures, limiting concentration to 450 ppm requires halting emissions at current levels.
因为大气碳含量增加表现在气候变化上要经过几年的时间，把它限制在450ppm的水平上需要我们现在就终止排放。
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