What would the world look like when it is four degrees warmer? It will likely mean one to two billion people will not have access to adequate fresh water because of the major shift in rainfall patterns, said Nigel Arnell, director of the Walker Institute for Climate Systems Research at the University of Reading in Britain.
Up to 15 percent of existing or potential cropland - and 40 percent in Africa - will become too dry and too hot for food production. While there might be some gains in northern areas like Canada and Russia, generally the soils there are not suitable for crops, he said.
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