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(8/24/2004, Denver, CO) Researchers have found evidence that nitrogen compounds from Front Range tailpipes, power plants, crop fields and cattle feedlots has altered the subalpine forest and alpine tundra in the Rocky Mountain National Park's Loch Vale watershed. Each Tuesday, park technician Lisa Foster samples stream water, collects precipitation that falls on the Loch Vale experimental site, and downloads data for scientist Jill Baron, who works for the U.S. Geological Society. (she is not in this photo) Boulder resident and hiker/climber Carla Litz looks for a couple of people climbing above Loch Vale. (PHOTO BY JUDY WALGREN/ROCKY MOUNTAIN NEWS)

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