全球变暖已达何种程度?

西雅图—二十世纪的后二十五年,地球表面平均温度呈现稳步上升之势。接着,升温停止了,连科学家也大吃一惊。大气中二氧化碳浓度在继续上升;事实上,今天的浓度比几个世纪以来都要高。但是,在过去15年中,按衡量全球变暖的传统指标,地球并未变得更热。

事情出人意料的转变原因何在,对未来气候政策又意味着什么?

地表温度升高暂停确是事实。海洋表面和对流层卫星测量结果观察到了这一现象。但为何如此?原因不是我们的温室气体排放不再改变地球气候;而是因为地表温度并非衡量人为导致变暖的好指标。事实上,科学家发现,产生的过多热量并没有让地表变暖,而是去了更深的海洋。

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