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Pittsburgh, the Iron City, is in the midst of an economic resurgence. That was Professor Robert Kedzie, a legendary chemistry professor at Michigan Agricultural Faculty (later, Michigan State University) and a pioneer client advocate who had helped the country end the follow of manufacturing arsenic-laden wallpaper and unstable kerosene.\n\nThen there are the chemical substances of trade and science, like chlorine, bromine, industrial- energy disinfectants, benzene, industrial solvents, pesticides and herbicides that cause cancer, perchlorate that damages the thyroid and distorts physical growth, and plenty of many others.\n\nIf the rezoning passes as proposed, it’s going to create 3.6 million square toes …