Maine buried 20,000 old tires beneath a road and they helped against frost damage. Now engineers are exploring them for walls, highways and more In 2012, Bellingham used porcelain from 400 recycled toilets to build a roadway, diverting about 5 tons of waste from landfill. It earned the world's first official "Greenroads" certification In 2020, California repaved a highway using recycled materials, including 150,000 plastic bottles per mile; it could last 2-3 times longer than conventional asphalt