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Scientists warn Earth is facing a 'state shift'

The Earth may well be headed for an irreversible 'state-shift', a tipping point where human activity puts so much stress on ecosystems that it can no longer sustain us. That's according to a new report published in the journal Nature which says that if human populations continue to grow at the current rate, it could be a matter of just a few decades before ecosystems shift into a new state. Marc Montgomery discusses the report with one of its co-authors, Professor Arne Mooers of British Columbia's Simon Fraser University. 

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