lol. Cry about it.

Goetzim, restoration of the Pleistocene (pre-human) ecosystem is impossible for so many reasons it is impossible to list them all. Here are a few of the most important ones. 1. Foremost, and most obvious, the Pleistocene climate no longer exists. 2. The Pleistocene megafauna no longer exist (buffalo, elk, brown bear, etc. are but a pitiful remnant of the dozens of species that existed then, and in any case are actually relatively recent Eurasian immigrants). 3. The Great Plains are nearly 100% privately owned and are fully inhabited up to the human ecological carrying capacity. The remaining grasslands are nearly all devoted to range livestock production; in fact the private Great Plains grasslands account for the largest share of the U.S. beef cow herd. Now then, what to you propose to do with the people who live there now? In know for a fact, since I am one of them, that you would find them difficult to dislodge. Finally, the fire cycle in temperate grasslands is not irregular, it is extreme regular if allowed to happen. Granted, the arrival of humans in North America completely changed the fire regimen (see Stephen Pyne for more information). However, this human-mitigated fire regimen in fact created and maintained the Holocene Great Plains grasslands that you confuse with Pleistocene conditions. In the absence of human-mitigated fire, and the absence of tree destroyers such as the elephants and giant ground sloths, the area would convert to low-grade woodlands of little use to man or beast.