Early white visitors to the American West were impressed by its bounty: natural beauty and riches that seemed to stretch to the horizon.
But the resources could be exhausted, and in some cases were.
Weber State University professor Sara Dant writes of the progression through the years in her book Losing Eden: An Environmental History of the American West.
The timeline stretches thousands of years, from the migration across the Bering land bridge to the present day.
We hear Sara Dant's take on the use and abuse of the West.