![<p>An aircraft drops a load of fire retardant slurry above the High Park wildfire about 15 miles west of Fort Collins, Colo., on Tuesday. 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.</p>](https://hagadone.media.clients.ellingtoncms.com/ARTICLE_306229969_AR_0_PFNDFMLBBWRG_t1170.jpg?5cc718665ab672dba93d511ab4c682bb370e5f86)
<p>An aircraft drops a load of fire retardant slurry above the High Park wildfire about 15 miles west of Fort Collins, Colo., on Tuesday. 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.</p>
June 22, 2012
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![Wildfires spark debate over use of fire retardant](
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June 22, 2012 9 p.m.