To illustrate their importance, these relationships provide around half of all marine photosynthesis

But when scientists made the water 5°C warmer, the partnership stopped working—and the results suggest the algae may even become parasitic.

While these species did manage to raise their “growth rate thermal optimum” (their ideal temperature for reproduction), they did not evolve to save their symbiotic relationship.

We are in so much trouble if we don’t get this under control. But 5C is worst case, so we might not reach this point. Might…

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