Areas that absorb more carbon than they emit are called carbon sinks. Depending on who you ask, the greatest carbon sinks are either the oceans or forests, and this status can change as the areas’ ability to absorb carbon changes. A 2011 TG Daily article cites research that suggests that forests are the biggest carbon sinks on land and that between 1990 and 2007 they absorbed much more than any other carbon sink on earth at an average of 2.4 gigatons a year.
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