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In this Tuesday photo provided by the Colorado National Guard, an aircraft drops a load of fire retardant slurry above the High Park wildfire about 15 miles west of Fort Collins, Colo. The ammonium phosphate dropped from airplanes to slow the spread of raging wildfires can turn a pristine mountain stream into a death zone for trout and some say the retardant has never been proven effective.

Debate over fire retardant toxicity rages

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­CHEYENNE, Wyo. (AP) -- Add another concern for the tanker plane pilots who barnstorm low over treacherous terrain, in vintage aircraft, to bomb fire retardant around raging mountain wildfires: Endangered species.

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