Noted: Shanan Peters, a palaeobiologist at the University of Wisconsin-Madison, isnt so sure the paper is noteworthy. Its primary result, he points out, is to overturn Mayhews own prior finding and bring the long-term diversity results into line with ecological common sense. “Palaeobiologists and climatologists have long referred to warm intervals as climate optima,” he notes, “precisely because it is during such times that palm trees and alligators inhabit the Arctic and life appears to be diverse and flourishing.”