"Wilderness, then, assumes unexpected importance as a laboratory for the study of land-health.... In many cases we literally do not know how good a performance to expect of healthy land unless we have a wild area for comparison with sick ones.."

Aldo Leopold
"Wilderness,"
A Sand County Almanac, 1949

 


colorful lichens on basalt boulders of Pilot Rock, Photo by T. Scott Williams/NPS

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