View of Mexico City amid thick smog due to pollution on January 24, 2018. / AFP / PEDRO PARDO
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The idea of spraying a haze of sun-dimming chemicals high above the Earth as a quick way to slow global warming faces so many obstacles that it may not be feasible, a leaked draft U.N. report says.The U.N. review of a planetary sunshade, mimicking how a big volcanic eruption can cool the planet with a veil of debris, is part of a broad study of climate technologies ordered by almost 200 nations in the 2015 Paris Agreement.The draft, by the Intergovernmental Panel on Climate Change (IPCC) about ways to limit warming to 1.5 degrees Celsius (2.7 Fahrenheit) above pre-industrial times, is due for publication in October.Allen said he was giving his personal views, not of the IPCC draft of which he is an author.The draft also says rising temperatures could breach 1.5C by mid-century unless governments take unprecedented action.
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