The Fate of the Earth Symposium explores the challenges and opportunities we face in enhancing human well-being while protecting the environment. This symposium brings distinguished thinkers from around the world to explore what we know, what we need to know, and what we must do as we move into a century of unprecedented environmental change, technological advancement and scale of human activity. This symposium is made possible through the generous endowment of Barbara Sawyer-Koch and Donald Koch.