Research published in Nature Communications showed that periodic wet phases in the Sahara were driven by changes in Earth's orbit around the Sun and were suppressed during ice ages. For the first time, climate scientists have simulated historical intervals of Saharan "greening", providing evidence of how the timing and intensity of these wet events were also remotely influenced by the effects of large, distant high-latitude ice sheets. Northern Hemisphere. Lead author Dr. Edward Armstrong, a climate scientist from the University of Helsinki and the University of Bristol, said: "The cyclical transformation of the Sahara desert into savanna and forest ecosystems is one of the most spectacular environmental changes on the planet."by the University of Bristol)
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