All this comes under the heading of what the journalist Thomas L. Friedman has called "the really scary stuff we already know." Much worse is what he calls "the even scarier stuff we don't know." The problem, Friedman explains, is that what we face is not global warming but "global weirding." Climate change is nonlinear: everything is connected to everything else, feeding back in ways too bewilderingly complex to model. There will be tipping points when the environment shifts abruptly and irreversibly, but we don't know where they are or what will happen when we reach them.
( Ian Morris )
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