This lecture, an updated version of Dr. Sanford's 1991 lecture at the TJS summer conference, will expose major scientific fallacies that permeate environmentalism. Examples of flawed science will be selected from among the topics: ozone, global warming, the extinction of species, DDT, radon, dioxin, recycling, organic farming, and acid raid. Dr. Sanford will explain the systematic errors of environmentalism as the result of irrationalist philosophy.