如果把其它和二氧化碳有相同效果的温室气体，例如甲烷，也算在内的话，总含量将接近440ppm。
When other greenhouse gases such as methane are included, the total level in the atmosphere, known as the carbon dioxide equivalent, is closer to 440ppm.
如果把其它和二氧化碳有相同效果的温室气体，例如甲烷，也算在内的话，总含量将接近440ppm。
When other greenhouse gases such as methane are included, the total level in the atmosphere, known as the carbon dioxide equivalent, is closer to 440ppm.
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