碳汇(英语:carbon sink;又名碳吸储库或吸储库)是能够无限期累积及储存碳化合物(特别是二氧化碳)的天然或人工“仓库”,例如森林、土壤、海洋、冻土等。碳汇作为温室气体增加之缓冲区,近年已渐饱和。因京都协议书之缘故,公众对碳汇的概念开始留意。
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