The Sierra Club is suing the U.S. Forest Service. It wants the court to block aspen logging on the national forests in Michigan, Wisconsin, and Minnesota. The Sierra Club says the Forest Service allows too much clearcutting of aspen. The suit says that's holding back re-growth of native pine and hardwood forests. The lawsuit is a sign of the times: American forests are in transition. Mainstreet Radio's Stephanie Hemphill has the first in a series of three reports on how things are changing in the Northwoods.