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AFP: Sahara made slow transition from green to desert: study: "Sahara made slow transition from green to desert: study

WASHINGTON (AFP) — The Sahara became the world's biggest hot desert some 2,700 years ago after a very slow fade from green, according to a new study which clashes with the theory that desertification came abruptly.

Six thousand years ago, the massive arid region dominating northern Africa was quite green, a patchwork of trees and savannas as well as many sparkling lakes."