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Earth has stayed habitable for billions of years – exactly how lucky did we get?

By Toby Tyrrell, Professor of Earth System Science, University of Southampton
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It took evolution 3 or 4 billion years to produce Homo sapiens. If the climate had completely failed just once in that time then evolution would have come to a crashing halt and we would not be here now. So to understand how we came to exist on planet Earth, we’ll need to know how Earth managed to stay fit for life for billions of years.

This is not a trivial problem. Current global warming shows us that the climate can…


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