For 50 years, visitors to Alaska's Denali National Park were ferried by shuttle buses along a 92-mile road to take in sweeping vistas, watch rambling bears, moose and caribou and gaze at the snowy flanks of North America's tallest peak. Not this year. This summer and next year, the park's sole road will remain closed at its halfway point, victim to a warming climate that has triggered the collapse of a mountain slope. The site, called Pretty Rocks, is at a high point on the unpaved road. Since last August, it has been considered unsafe for public travel. The landslide there used to be gradual and measured in inches per year, but it has accelerated dramatically, hastened by thawing of the underlying layers of once-perpetually frozen soil known as permafrost. FILE PHOTO: Geologi...
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