Driven by Earth´s orbit, climate changes in Africa may have aided human migration
(WorldNews Environment)

An aerial view of northern Africa, the Arabian Peninsula and the Mediterranean Basin. A new study led by University of Wisconsin-Madison`s John Kutzbach shows that changes in Earth`s orbit, greenhouse gases, and ice sheets influenced the planet`s climate over the last 140,000 years and may have provided wetter, greener corridors at times that permitted human migration out of Africa and into the Middle East. Image courtesy of Google Earth In 1961, John Kutzbach, then a recent college graduate, was stationed in France as an aviation weather forecaster for the U.S. Air Force. There, he found himself exploring the storied caves of Dordogne, including the prehistoric painted caves at Lascoux....