The Yale School of Forestry and Environmental Studies hosted a Symposium on April 3rd, 2009 honoring the centennial of the graduation of Aldo Leopold from the school and his acclaimed contributions to environmental conservation. Leopold became a leading and radical voice in American conservation, launching his land ethic in his celebrated book, “A Sand County Almanac.” The day-long symposium appraised the Leopold legacy, examined his relevance today, and explored how his land ethic might be reformulated for the global environmental and social challenges of the 21st century.