2015-07-23. Hot spells doomed the mammoths.

posted Jul 25, 2015, 3:32 PM by Alan Gould
By Elizabeth Pennisi, Science. For GSS Life and Climate chapter 10. 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.... http://news.sciencemag.org/evolution/2015/07/hot-spells-doomed-mammoths