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The Discovery of Global Warming                     June 2010

Images of drought and mass starvation in the Sahel, at the southern edge of the Sahara, dismayed the public in the early 1970s. Later studies confirmed a suspicion that the disaster, although partly due to a natural long-term climate cycle, was exacerbated by overgrazing, which converted grassland to scrub and hardpan.

Courtesy United Nations - FAO.