Only for students who have not taken RNR 150C1 (Sustainable Earth: Natural Resources and the Environment). See University General Education, Tier One. Life support systems on planet Earth are becoming progressively more challenged by a global population that recently exceeded 7 billion people. With a focus on natural ecosystems, we will explore how society deals with threats to the planetary goods and services on which life depends. Sustainability lies at the intersection of the environment, society and economics. We will explore environmental, societal and economic strategies humans might develop to become effective stewards of our natural resources and achieve a sustainable Earth.