Five surprising effects of Arctic climate change
WWF
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One way is to get trees and other plants growing in the deserts to take carbon dioxide out of the atmosphere. In Africa this could be accomplished by using darker soils to cause convection (most of the rain in the Tropics is convectional rain) and using solar air heaters on every rooftop in cities near the sea to get air heated and rising. Darker soils can be achieved by using biochar — many arid locations have light coloured soils. See http://airartist.blogspot.co.za/2017/02/are-cool-roofs-reducing-rainfall.html

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