Hot spells doomed the mammoths

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http://news.sciencemag.org/evolution/2015/07/hot-spells-doomed-mammoths

Source:  By Elizabeth Pennisi, Science
For Investigation:  10.3

Excerpt: About 30,000 years ago, mammoths, giant sloths, and other massive mammals roamed the earth. Twenty thousand years later they were all gone. Some researchers blame human hunting, but a new study claims that abrupt shifts in climate set in motion a downward spiral for many of these species, one that humans aggravated. The results, the authors say, are a warning to modern humans that, if not slowed, current warming could doom many more species....

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