Discussion
Consider the following statements about ocean uptake of carbon dioxide.
1. The ocean has taken up a large fraction of anthropogenic emissions.
2. The uptake acidifies the surface ocean.
3. The uptake capacity is unlimited.
Answer: A
The first two are correct. The third is wrong, since the capacity falls as the surface saturates and as warming reduces the solubility of the gas itself. Uptake has already acidified the surface. Capacity falls as the surface saturates.
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