In their model, the researchers doubled the concentration of atmospheric carbon dioxide and recorded the magnitude and geographic pattern of warming from different factors.

在他们的模型中，这些研究人员加倍关注大气中的二氧化碳量，并记录下有不同原因引起的变暖的多少和覆盖的地理类型。

youdao

Those who pay honest attention to long-term climate patterns will note that atmospheric CO2 concentration fluctuations do not lead, but typically follow, temperature changes.

那些热心关注长期气候模式的人们会发现大气中的二氧化碳浓度波动不是温度变化的诱因，而是其结果。

youdao

The concentration of atmospheric carbon, an important indicator of global warming, has shot from 280 parts per million in pre-industrial times to 386 PPM last year and appears to be accelerating.

全球变暖的重要指示——大气的碳浓度——已经从工业社会前的280ppm (parts per million)激增到386 p pm，而且这一速度似乎还在增加。

youdao

For the first time, scientists measured an average concentration of atmospheric carbon dioxide of 400 parts per million in Mauna Loa, Hawaii, where the National Oceanic and Atmospheric Administration observatory is located, on Thursday.

CNN: CO2 levels hit new peak at key observatory

Since 1960, the atmospheric concentration of carbon dioxide has risen from 310 to 390 parts per million.

CNN: What if carbon dioxide were as black as oil?

But the actual increase in its atmospheric concentration is a low exponent.

FORBES: Global Warming Flatliners