carbon sink
noun
plural carbon sinks
: a location (such as the ocean, the soil, or a forest) that stores substances which contain carbon and especially carbon dioxide
Advocates of "sequestration" argue that the ocean already functions as the world's largest carbon sink: it contains 50 times more carbon dioxide than the atmosphere, most of which is stored in sediments on the ocean floor.—Linda Baker
Research has found that drought and declining water availability are increasingly impeding the ability of tropical ecosystems to soak up carbon dioxide, making the tropics a less effective carbon sink.—Glenn Scherer
Peatlands serve as a major carbon sink. Their defining feature is a thick soil layer of leaf litter and other dead vegetation in a waterlogged state, meaning it can't fully decompose, which prevents vast amounts of carbon emissions.—Isabel Esterman
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Merriam-Webster unabridged
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