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Department of Biology
King’s College
London, U.K.

" The development of deserts and arid lands dates back into the Pliocene as global temperatures and rainfall became reduced and former forests broke up. In the last 0.5 million years the increasing intensity of climatic fluctuation in the glacial interglacial cycle, coupled with human impact in the current interglacial era, has led to the extensive arid lands of today....

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