The extinction of Neaderthals by Cro-Magnons. (I feel particulary guilty of this because, acourding to Mitochondrial DNA genetic studies, the ancestors of Scandinavians and and some ancient Britons, like Cheddar man, were the first people in Europe; arriving 45,000 years ago from Asia Minor then going north from the Balkans across E. Europe into Scandinavia) We didn't intentionally kill them, I think, but our thirst for hunting grounds led to us driving then into the mountains, where they starved.

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