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A Wobbly Start for the Sahara

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Science  16 Jul 1999:
Vol. 285, Issue 5426, pp. 325
DOI: 10.1126/science.285.5426.325

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In the 15 July issue of Geophysical Research Letters, climatologists propose that a tiny change in the angle of Earth's orbital axis triggered a cascade of events that turned an ancient Eden into the Sahara desert. It is the first time anyone has demonstrated that a change in Earth's tilt can cause such a sudden vegetative feedback.