Listen to scholars, including Baird Callicott, Environmental Ethicist, author and Professor of Philosophy at University of Wisconsin. Susan Flader, Leopold scholar, introduces Callicott and describes how she became a Leopold scholar. Flader and Callicott co-edited The River of the Mother of God and Other Essays by Aldo Leopold (1991 University of Wisconsin Press). Callicott has a new book about to be released: Thinking Like a Planet: The Land Ethic and The Earth Ethic which addresses global climate change in light of values-ethics.