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The Kepone contamination episode of 1966-75 was a milestone that focused an entire nation’s attention on environmental hazards and our need to do better in recognizing and avoiding them. We have learned a great deal from that unfortunate story. The evolution of American environmental law since the Kepone debacle has repeatedly used the incident as a touchstone in identifying environmental pollution’s causes, effects, and potential solutions. This essay offers four propositions, about two things that have changed, and two things that have not, in the years since Kepone, taking account of where we are, and seeking some points of consensus.