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Land decay to displace tens of millions, global survey warns

MEDELL├ŹN, Colombia: Land degradation will unleash a mass migration of at least 50 million people by 2050 -- as many as 700 million unless humans stop depleting the life-giving resource, more than 100 scientists warned Monday. Already, land decay caused by unsustainable farming, mining, pollution, and city expansion is undermining the well-being of some 3.2 billion people -- 40 percent of the global population, they said in the first comprehensive assessment of land health. Land depletion threatens food security for all…