We all know how clearcutting causes erosion and we've all seen the pictures. But this, from the Seattle Times, is pretty much the poster pic for it. This is a Weyerhaeuser site in southeastern Washington. http://seattletimes.nwsource.com/ABPub/zoom/syndication/2004076441.html

Sniffing around a bit, I found some graphical resources on this subject for other parts of North America as well:
Stop Clearcutting California
Clearcutting in Canada: The War of the Woods