Now I can't find link. It must be second edition, not published freely. From web site, just overview of the updates. But while searching for this. Found anoth

Now I can't find link. It must be second edition, not published freely. From web site, just overview of the updates. But while searching for this. Found another popular book that had theory that it was rats, and the rats had no natural predator's and ate all the palm tree roots. EXTENSIONS Since my book’s initial publication in 2005, information has continued to accumulate about collapses, and about avoidances of collapses. I shall mention here three of these recent extensions, to our understanding of Easter Island, the Maya, and Angkor. First, I summarize below the striking new evidence that Andreas Mieth and Hans-Rudolf Bork have published concerning the widespread Polynesian felling and burning of trees on Easter Island long before European arrival. Second, measurements of markers that reflect paleoclimate have provided increasing evidence for severe droughts that contributed to the decline of Classic Maya cities in the Southern Maya lowlands. Finally, the biggest recent advance (summarized in a new chapter included in my book’s 2011 edition) has been in our understanding of the decline of the Khmer Empire based at Angkor