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Thanks very much for your comment. I completely agree with you -- the 2 degree limit is a political choice from the Cancun Agreements. We do not say that it is "safe" below 2 degrees. All we say is that exceeding this would put the world at increased risk of a number of different impacts. Indeed, every degree (or half degree or quarter degree) of warming puts the world at a greater risk of impacts, including surpassing of critical tipping points in systems, leading to cascading impacts. We framed the piece around the 2 degrees C limit because it is the one that has been embraced by the UNFCCC (for now, although it could be updated to 1.5 degrees C in the future after the scientific review) and the question we were posing was one about the timeframe for emissions reduction contributions under the UNFCCC.
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