Each year in the United States alone, an estimated
two-hundred-fifty-million tires are scrapped. While some enterprising
companies have found ways to recycle them, up to eighty-percent of waste
tires still end up stockpiled or thrown away in landfills. But now some
researchers think they may have found a way to help control air
pollution with a substance made from old tires. The Great Lakes Radio
Consortium’s Wendy Nelson reports: