Maybe climate variability, not cold, stymied agriculture (and civilization) till recently. http://www.des.ucdavis.edu/faculty/Richerson/AgOrigins_2_12_01.pdf …pic.twitter.com/P8E1MmapTu
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@patrickc Patrick, amazing perspective! I have studied the work of Edward Dewey the implications still astonish me. http://qr.ae/RPz1BI