Introduction to the Earth as an integrated system composed of interacting biosphere, hydrosphere, cryosphere, lithosphere, and atmosphere subsystems. Major themes include earth system stability, instability and capacity for change on all time scales, including human-induced climate change. Carries natural science divisional credit (with lab) in CAS. Effective Fall 2018, this course fulfills a single unit in each of the following BU Hub areas: Scientific Inquiry I, Quantitative Reasoning I, Research and Information Literacy.