Lecture, three hours; discussion, one hour. Requisite: one course from Life Sciences 30B, 40, Mathematics 3B, 31B, Statistics 10, 12, or 13. Recommended requisite: one course from 51, 101, 102, 103, 104, 105, M106, 107, Environment 175, or equivalent background for reading quantitative scientific literature in climate change. Projections of future anthropogenic climate change and understanding of natural climate variability depend on international climate model intercomparison projects, on large observing systems coordinating space and ground observations, and on multi-scientist climate assessments. Lectures, readings and projects with presentations address current issues in the scientific literature on assessment of climate change for students with prior background in the atmospheric, oceanic and environmental sciences. P/NP or letter grading.