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I believe this subject merits a section of its own for the following reasons
Oceans have become more acid than at any time in the last 35 million years
Processes in the ocean are much less well understood than those on land. For example there are thousands of calcifying organisms on earth and we have investigated only six to ten of them.
Half the photosynthesis on earth takes place in the ocean.
Nearly half the excess CO2 we produce is absorbed in the ocean
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