>> Land that is left without cattle fares better This is not true of North America's grasslands. Pre-contact, tens of millions of bison fed on the grasslands m

>> Land that is left without cattle fares better This is not true of North America's grasslands. Pre-contact, tens of millions of bison fed on the grasslands much like cattle do now, with certain differences. Most cattle ranching operations are small so there are a lot of fences, which leads to intense grazing in some areas and relatively little in others. Grasslands have a symbiotic relationship with grazers. Without regular grazing and lightning-caused fires (indigenous populations also regularly burned large areas to help grazing animals), grasslands tend to progress to either bushy forests or dustbowls. In fact, the greatest danger to the grasslands of North America is farming.