CH 4 <子> < /订阅>和<子> 2子> < /层次展示相关在更新世:[![在这里输入图像描述][1]][1]来源:[trustyetverify.wordpress.com][2]这种耦合的原因是什么?[1]https://i.stack.imgur.com/KDvy9.png [2]: https://trustyetverify.wordpress.com/2018/04/08/the-good-old-times-when-carbon-dioxide-and-methane-levels-as-well-as-temperatures-were-low/