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On a summer evening in June 2005, Susan Wallace-Babb went out into a neighbor's field near her ranch in Western Colorado to close an irrigation ditch. She parked down the rutted double-track, stepped out of her truck into the low-slung sun, took a deep breath and collapsed, unconscious. A natural gas well and a pair of fuel storage tanks sat less than a half-mile away.

YOSEMITE NATIONAL PARK, Calif. – On any given summer evening about 60 tourists gather in campground amphitheatres here for park ranger presentations. Astronomy, geology, human history, fire ecology are on the regular schedule of program topics.