Despite mounting evidence of environmental factors contributing to disease, there has been fairly little regulatory action against industrial chemicals in the U.S. since the high-water mark of the 1970s–1990s.
For much of the twentieth century, exposure science was tethered to policy, delivering enormous returns: the Clean Air Act generated benefit-to-cost ratios exceeding 30:1,[2] leaded gasoline phase-out returned $17–$200 per dollar invested,[1] and the Montreal Protocol prevented millions of cancer cases.[3]
Key wins: PCB & DDT phase-outs cut dietary DDT from 13.8 to 1.88 mg/day.[4] Leaded gasoline phase-out dropped blood lead from 17.1 to 2.7 µg/dL.[5] These prove the model works—but the pipeline has stalled.