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Global warming refers to the average temperature of the atmosphere, oceans, and
Global warming refers to the average temperature of the atmosphere, oceans, and
游客
2024-06-17
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问题
Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. [br] Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.
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答案
1750
解析
参见第3个小标题TYPES OF GREENHOUSE GASES下面第4段第3、4句:In 1750 there were about 281 molecules of carbon dioxide per million molecules of air.Today atmospheric carbon dioxide concentrations are 368 ppm,which reflects a 31 percent increase.
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