http://backstoryradio.org/shows/untrammeled-2016/
"BackStory is quitting the city and heading into the wild. In this episode, Brian, Ed, and Peter return to America’s fascination with wild places and learn how we impact even the most remote corners of our country. The Guys explore how early European arrivals created wilderness out of a landscape long shaped by human intervention, find out how the city of San Francisco controlled the remote Hetch Hetchy valley, hundreds of miles away, and ask how our ideas about wild places have changed over time."
Definitely worth listening to. It describes how what we have been taught was pristine wilderness, especially in the eastern USA, wasn't and why. The impact from man happened long before white settlers came to North America.