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Aug 25, 2009

Avoiding the 2°C threshold

To have a 90% chance of keeping temperature rise below 2°C – a limit widely accepted as likely to prevent dangerous climate change – cumulative carbon-dioxide emissions for the period 2000–2500 must remain below a median estimate of 170 petagrams of carbon. Depending on the climate sensitivity and carbon-cycle feedback, that figure could range from –220 petagrams to 700 petagrams, say researchers in Canada.

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