Beavers are as big as bears, the short faced bear stands more than 5 foot at the shoulder, almost twice the size of a grizzly bear. Eight thousand years later the ice caps are wasting away. Game and vegetation is available for the taking. Theirs is a world of plenty - an Eden. Just a thousand years later, the huge ice caps, horses, sloths, other giant animals, the carnivores that ate them, and the paleo-indians, all are gone.
Climate is like it is today.
The parklands are gone. There are belts of closed canopy forest on the coasts and a vast grassland in the center of the North American continent. The few people we find are living in small isolated bands. Their stone technology is far less developed than that of the paleo-indians. These are the mysteries of the extinctions at the end of the last Ice Age.