A paper in press in Current Biology (press release here) looks at mitochondrial DNA of mammoths and advances a primarily environmental cause for the mammoth extinction. Razib explains why such a black-and-white dichotomy is unhealthy.
Looking at a different hypothesis, also environmental, for the mammoth extinction (comet impact), Archy places the black-and-white dichotomy in the historical context and tries to figure out why the environmental hypotheses are so popular nowadays, while extinction at the hands of human hunters is not a popular idea any more.
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