As we continue to build up carbon in the atmosphere to unprecedented levels, we never know when the next emitted carbon molecule will tip over some ecosystem and trigger a nonlinear climate event — like melting the Siberian tundra and releasing all of its methane, or drying up the Amazon or melting all the sea ice in the North Pole in summer. And when one ecosystem collapses, it can trigger unpredictable changes in others that could alter our whole world.
NYT writer Thomas L. Friedman in his Wednesday column
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