...Monsanto’s past, especially its environmental legacy, is very much with us. For many years Monsanto produced two of the most toxic substances ever known— polychlorinated biphenyls, better known as PCBs, and dioxin. Monsanto no longer produces either, but the places where it did are still struggling with the aftermath, and probably always will be. [discusses environmental impacts of Monsanto's previous chemical businesses in Alabama & W. Virginia, USA, and in Wales; Monsanto's chemical business has been spun off into Solutia, a separate company]