This article in the New York Times describes periodic fluctuations in the Earth’s orbit that has resulted in mass extinctions of mammals in the past. And here’s the great news:

Dr. van Dam said the 2.5-million-year cycle “has entered the critical stage corresponding to a relatively circular orbit.” But any period of high turnover may be tens of thousands of years away, he said. And it may be good news for both mice and men that the climate system has changed significantly in the last three million years.

(Via Drudge)

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