Ancient microbes frozen for thousands of years in Siberia's permafrost are thawing, researchers have warned - and could pose a 'disastrous' threat to the human race.Virologist Jean-Michel Claverie has warned that as global warming defrosts ice which has remained frozen since tens of thousands of years before the dawn of civilization, ancient viruses could be unleashed.If an ancient disease killed Neanderthals, for example, their frozen corpses could still harbor infectious viruses, Claverie warns - and melting ice could reveal them.
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