Even today, to suffer for lack of water resources are two billion people in less than two decades could be double. It is a global emergency that is escalating. From California to the Caucasus, passing through Italy, in the next century the water supply may be harder today. All because of global warming threatens 97 river basins that depend on the winter snows to give water to two billion people in the Northern Hemisphere during the summer. The warning comes from researchers at Columbia University.
The snow season is an important source of water that reaches the people and farmland in spring and summer, when there is increased demand for resources water. With global warming, say experts, snowy winter precipitation decrease, while increasing those rainy, reducing the accumulation of snow that then, seasonal, melt and flow downstream.
“The consequences of reduction in snow cover are not the same everywhere, also vary according to where and when people need water, “says study author, Justin Mankin, that” in many places the water managers must prepare for a world where the reserves snowy no longer exist “.
Of the 97 river basins at risk, the researchers have identified 32 where the melting snow provides a crucial share of the water necessary to 1.45 billion people . Areas affected range from California and Mexico to Morocco and the Caucasus, through Portugal, Spain, southern France, Italy and the Eastern Balkans.
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