Study: Irrigation masking global warming

United Press International: Expanding irrigation is helping feed the world's billions of people and may even mask global warming, but the future could bring problems, scientists say. Columbia University researchers say some major groundwater aquifers, a source of irrigation water, will dry up in the future hitting people with the double blow of food shortages and higher temperatures, an article in the journal Geophysical Research says. "Irrigation can have a significant cooling effect on regional ......

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