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> Warmer times are times of success and prosperity for man-kind and for the biosphere. For example, during the Roman warm period the climate was warmer and wetter so that the Northern Sahara was the breadbasket of the Roman empire.
Good point here. In most cases warmer = wetter and colder = drier. It is possible that warmer conditions could make open up swathes of the Sahara and the Outback for more intensive settlement and agriculture. Chris Wayan's speculative warmer Earth (http://worlddreambank.org/D/DUBIA.HTM) brings up this hypothesis.