Methane accounts for about 20% of the 20th century enhanced greenhouse effect. Carbon dioxide makes up about 60%, and other gases account for the remainder.

20世纪，甲烷造成的温室效应增加量大概占总增加量的20%，二氧化碳大约占60%，其它气体贡献了余下的增加量。

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Methane accounts for about 20% of the 20th century enhanced greenhouse effect. Carbon dioxide makes up about 60%, and other gases account for the remainder.

20世纪，甲烷造成的温室效应增加量大概占总增加量的20%，二氧化碳大约占60%，其它气体贡献了余下的增加量。

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