Blue crabs (Callinectes sapidus) grown for two months under today's CO2 levels of 400 ppm (left) and under very high CO2levels of 2,850 (right). This species showed an unexpected response to CO2 level—the crab grown under the highest level (representing ten times the level of CO2 in the pre-industrial atmosphere) grew a heavier, larger shell. (Photos courtesy of Justin Ries, University of North Carolina)[back]
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