What about so-called tipping points, like the rapid, accelerating, and simultaneous loss of Greenland or West Antarctic ice sheets, the drying out of and die-back of the Amazon, and a change of the Atlantic Ocean circulation? The high level of uncertainty on each, and a complexity that is greater than the sum of its parts, make many tipping point scenarios unscientific. That’s not to say that a catastrophic tipping point scenario is impossible, only that there is no scientific evidence that one would be more probable or catastrophic than other potentially catastrophic scenarios, including an
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