Editor's Note: This article was co-authored by Dennis Mitchell. Earth’s geological, archaeological and written histories are replete with climate changes: big and small, short and long, benign, beneficial, catastrophic and everything in between. The Medieval Warm Period (950-1300 AD or CE) was a boon for agriculture, civilization and Viking settlers in Greenland. The Little Ice Age that followed (1300-1850) was calamitous, as were the Dust Bowl and the extended droughts that vanquished the Anasazi and Mayan cultures; cyclical droughts and floods in Africa, Asia and Australia; and periods of vicious hurricanes and tornadoes. Repeated Pleistocene Epoch ice ages covered...
