Northern Short Grass Plains
While visiting this wonderful museum near Lethbridge, Alberta, Canada, I found some interesting information. It appears in the Northern Short Grass Plains warmer periods were less productive than the cold periods where there was increased moisture. With moisture being the constraint, biological activity as evidenced in bison populations actually increased during cool periods.
To quote an interesting book I found there, “Record in Stone, Familiar Projectile Points from Alberta” from the ‘Archeological Society of Alberta’:
The climate grew gradually warmer and drier, reaching a peak from 7000 years ago with summer mean temperatures as much as 3C warmer than today … productivity in the plains dropped.
and
As the climate became cooler and moister on the plains, grasslands productivity and hence bison populations rose. Cultural groups were again able to specialize in bison hunting, and from 5500 years ago onward we see evidence of repetitive use of bison jumps on the Northwestern Plains. …
I’m not sure the other ungulates (deer, elk, caribou, moose) faired as well during these periods in the boreal forest North of the Plains. However, it appears the weak maxima we experienced in the 80’s and 90’s is not the best for the flora and fauna that has evolved in my area.
The coming cold will not be all bad. 
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May 18th, 2008 at 4:32 am
Interesting to note: The Sahara forest went desert about 7000 years ago. And the SH has been cooler than the NH the last 30 years…. ‘global’ warming is apparently spotty at best. I’d say it was more like Massive, continent-wide cycles that take thousands of years to run, and the PDO, AMO and other cycles which we have only begun figuring out in the last 30 years, are just smaller cycles within.
In other words: situation Natural. Not man-made.
May 18th, 2008 at 9:08 pm
Maybe we can move to the Sahara when the ice comes back in 3000 years
More fun is the evidence that immediately following the ice’s retreat (~10,000 years ago) in the area I live, came humans. It is incredible the manner in which they manipulated these brutal surroundings to survive. They hunted the diminising mamoth, great bison, and NA camels but I wonder if they had competition from other sentient hominids like they did in Europe. That would be fun information.
Of course they became experts at using every last part of the plains bison. Homo sapiens did well with their inherent social structure in the harsh environment.