By William James Burroughs

This e-book is thoroughly written with all the right citations usual of an educational textual content. i discovered the writer to be common approximately what he is aware and the way he is aware it. additionally, Burroughs isn't afraid to inform you while he's speculating in place of interpretations in keeping with medical evidence. in spite of everything the e-book is a smart learn. i like to recommend it to an individual drawn to the weather that early homo sapiens developed in.

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All this appears to provide a consistent global picture of stability in tune with the evidence from the Greenland ice-core temperature records, and many of the proxy records in midlatitudes. In the tropics, however, there is one particular fly in the ointment: the desiccation of the Sahara. , 2000) . This dramatic shift has to do with the location of the region of rising warm moist air and cloudiness that encircles the globe in equatorial regions.

Second, many of the cores contained high-frequency variations during the last glaciation. These raised doubts about the dating of the strata in the cores, some of which had substantial gaps. It was not until more recent ice-core and ocean-sediment data became available that it was possible to check the timescales of these different records. , 1999) and Carp Lake in the Cascade Range in northwest USA (Whitlock & Bartlein, 1997) have enabled comparisons to be made across the northern hemisphere. These have confirmed that pollen records can be accurately dated back to the last interglacial, some 125 kya, and provide an extraordinary amount of additional information about how the climate has changed.

Seasonal meltback of sea ice was also reduced in the Southern Ocean. Upwelling systems associated with eastern boundary currents, such as off northwest Africa, led to significant cooling. The real surprise was in the limited cooling near the Equator in all oceans. Most of all, the western Pacific temperatures appear to have stayed essentially the same as modern conditions and in some cases were even warmer. Overall, the inference was that the Earth cooled surprisingly little during the ice age, except at high latitudes.

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