The steep cost of CO2 in the oceans

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Carl Zimmer reports on a new study on sea acidification and worries that we may be headed inexorably towards a massive wave of marine extinctions:

The acidification of the ocean today is bigger and faster than anything geologists can find in the fossil record over the past 65 million years. Indeed, its speed and strength — Ridgwell estimate that current ocean acidification is taking place at ten times the rate that preceded the mass extinction 55 million years ago — may spell doom for many marine species, particularly ones that live in the deep ocean.