A fascinating challenge facing today's environmental movement is how to best approach the reversal of past decisions that altered once-pristine environmental spaces for the sake of urgent man-made needs.

A fascinating challenge facing today's environmental movement is how to best approach the reversal of past decisions that altered once-pristine environmental spaces for the sake of urgent man-made needs.

Some types of environmental restoration projects are well-known; restored wetlands, for instance, or coal mine reclamation projects. Recently though, larger dam removal projects have started, a number of them in Washington state.