This course looks at the heavy footprint humans have placed on Planet Earth. We address, in turn, the main components of the habitable parts of the planet and examine the fundamental, natural processes within each. With this grounding we then superimpose the impact of indigenous people, and the excesses of post-industrial humanity, upon the Earth to reveal the consequences of the activities of modern society. The course emphasizes that environmental sustainability requires an understanding, not only of the processes that can be identified today, but the rate, sequence and nature of changes which have taken place in our recent past. Further, that environmental sustainability demands consideration, not only of environmental processes, but also the social and political constraints to change.