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carbon sink

noun

  1. natural reservoir that stores carbon-containing chemical compounds accumulated over an indefinite period of time.
L468987 on Wikidata ↗

Wiktionary

noun

  1. A natural or artificial reservoir that accumulates and stores some carbon-containing chemical compound for an indefinite period.

    A few years from now, these stems will develop into a barrier against erosion, a carbon sink and a habitat for distinctive Highland birds such as the capercaillie and ptarmigan.