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A draft U.N. report showed that deep cuts in greenhouse gas emissions of 40 to 70 percent by mid-century will be needed to avert the worst of global warming that is already harming all continents. The 26-page draft, obtained by Reuters on Thursday, sums up three U.N. scientific reports published over the past year as a guide for almost 200 governments which are due to agree a deal to combat climate change at a summit in Paris in late 2015. It says existing national pledges to restrict greenhouse gas emissions are insufficient to limit warming to 2 degrees Celsius above pre-industrial times



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