This class is an introduction to the emerging discipline of Earth System Science, which considers interlinked physical and biological processes. We will examine the major transformations occurring on the Earth, the causes of these changes (both anthropogenic and natural), and their likely consequences for Earth’s biological systems. The impacts of global change on specific systems, including fisheries, forests, agriculture, as well as impacts on ecosystem processes, biodiversity, biological productivity, and sustainability will be considered. An important aspect of this rapidly developing field of science is the ability to evaluate the validity of scientific claims as a basis for sound policy decisions. Thus, the course will emphasize critical thinking by asking you to carefully consider the nature of the scientific evidence discussed, and the integrity of public statements on this topic.