Toronto — One third of the world's arable land has been lost to soil erosion or pollution in the last 40 years, and preserving topsoil is crucial for feeding a growing population, scientists said in research published during climate change talks in Paris.
It takes about 500 years to generate 2.5 cm (one inch) of topsoil under normal agricultural conditions, and soil loss has accelerated as demand for food rises, biologists from Britain's Sheffield University said in a report published on Wednesday.
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