[fred_is_fred]

I call bullshit. Where in the American Southwest was it treed grasslands until it was overgrazed? I've been through the whole region from west Texas to Arizona, NM, Colorado and the Oklahoma panhandle. There was certainly problems in some of those regions during the Dust Bowl, but your general statement reeks of fiction. Phoenix was never the Serengeti in any times where humans were grazing animals.