A book was recently written by an author named Richardson B. Gill that is being hailed in the anthropological community as the last word in explaining the collapse of Mayan civilization. In short, Gill attributes the collapse to factors almost solely related to drought caused by global weather pattern fluctuations involving active volcanism in the region and a related shift of the mid-Atlantic high pressure region over the Yucatan peninsula in the ninth and tenth centuries A.D. He has come up with tough-to-dispute geological and meteorological evidence for the presence of these climate fluctuations and it is due to the nature of this evidence that he is being continually lauded in academia as the man who finally solved the Mayan mystery. I know you have stated that droughts are not sufficient cause for the end of a civilization, but he's talking about unheard of die-out-rates of over ninety percent for both the Mayan and hunter-gatherer populations in that geographic region. This seems to me to be precedent for the end of a civilization by means of almost pure physical deprivation. If they indeed "walked away," I think it was more due to an interpretation of the gods' perceived condemnation of the Maya's previous way of life. In essence, "look what it brought on its people." Hence the vandalism. Basically, when people can't get water, they die.How does this affect your own personal thesis on the Mayan collapse? • Ishmael.org, the work & philosophy of Daniel Quinn