Wired: Could human activity push Earth`s biological systems to a planet-wide tipping point, causing changes as radical as the Ice Age`s end – but with less pleasant results, and with billions of people along for a bumpy ride?
It`s by no means a settled scientific proposition, but many researchers say it`s worth considering – and not just as an apocalyptic warning or far-fetched speculation, but as a legitimate question raised by emerging science.
“There are some biological realities we can`t ignore,”…

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