Lecture, three hours. Corequisites: graduate atmospheric, oceanic, hydrological, and climate science courses. Biogeochemical cycles in terrestrial biosphere. Carbon/water/energy/nutrient dynamics. Observational techniques and results. Interactions of terrestrial biogeochemical cycles with climate system on timescales of seconds to centuries. Use of isotopes to study land biogeochemical cycles and climate. Anthropogenic perturbations of global terrestrial biogeochemical cycles and climate feedbacks. Response of land ecosystems to past and future global changes. S/U or letter grading.