0213001849

Did Humans Make The Sahara A Desert?

The story that emerged suggests that as communities of people spread, they changed the landscape to accommodate crops and livestock, causing an exchange in plant species that covered the ground for specimens that exposed the soil. As sunlight bounced from the brighter soil, it warmed the air, building a feedback loop that shifted the atmospheric conditions enough to reduce the frequent monsoon rains and benefit scrub vegetation over grasslands until rainfall virtually vanished, leaving only a scattering of hardy desert plants. (Click on title for full story.)