The world could be 2C° warmer in as little as two decades, according to the leading US climate scientist and “hockey stick” author, Dr Michael E. Mann. Writing in Scientific American in March 2014 (with the maths explained here), Mann says that new calculations “indicate that if the world continues to burn fossil fuels at the current rate, global warming will rise to 2C° by 2036” and to avoid that threshold “nations will have to keep carbon dioxide levels below 405 parts per million”, a level we have just about reached already. Mann says the notion of a warming “pause” is false.

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