Organized by Clark geographers Robert Kates and Billie Lee Turner and Harvard’s William C. Clark, an international symposium, “The Earth as Transformed by Human Action,” draws widespread attention from the global scientific community. The symposium will help lay the foundation for the creation of Clark’s George Perkins Marsh Institute, and encourage Clark’s research in earth system science and sustainability science. Three years later, Cambridge University Press will publish The Earth as Transformed by Human Action, co-edited by Turner and Kates. The book, a major stocktaking of the anthropogenic impacts on the planet and its ecosystems over 300 years, is deemed “a landmark study.”