Oil reserves and dwindling freshwater supply may get all the attention, but modern society is also overtaxing the ground itself.
An increasing number of scientists are starting to emphasize the extent to which soil - even more than petroleum or water or air - is a limited and fragile resource. Managing it better, and even improving it, will be vital to any equation that allows the earth to support the more than 9 billion people the UN estimates will live on the planet by mid-century.
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