TUCSON, Arizona, Sept. 24 -- The University of Arizona posted the following news release:

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Satellite data exposes escalating 'boom-and-bust' dynamic in greening drylands

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Dryland ecosystems cover 40% of the Earth's land surface and support over two billion people. According to a new study published in Nature Climate Change, they're becoming increasingly unstable.

Satellite records spanning over four decade . . .

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