We’re dumping loads of retardant chemicals to fight wildfires. What does it mean for wildlife?

Tim Ingalsbee, a fire ecologist and former wildland firefighter, directs the nonprofit Firefighters United for Safety, Ethics, & Ecology and believes, like Stahl, that state and federal fire agencies should be more restrained and targeted in their use of retardant.

"The price of just one air tanker load of retardant can fund so many more workers [on the ground]," he told EHN. "They're much more flexible and nimble and versatile than that air tanker, which has one single function."