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Removals by sinks.

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Explanation:

The change in concentration of a gas in the atmosphere is the difference between the sources (emissions to the atmosphere) and sinks (removals from the atmosphere). A number of sinks remove GHGs naturally from the atmosphere. Carbon dioxide (CO2) dissolves in the ocean, and is taken up by plants during photosynthesis.

answer at the divergent plate boundary in the middle of the ocean;