The Annual Report of the Climate Variability Program briefly describes research activities of Principal Investigators who are funded by NASA's Earth Science Enterprise Research Division. The report is focused on the year 2001. Utilization of satellite observations is a singularity of research on climate science and technology at JPL (Jet Propulsion Laboratory). Research at JPL has two foci: generate new knowledge and develop new technology.Halpern, David (Editor)Jet Propulsion LaboratoryCLIMATE; CLIMATE CHANGE; EARTH SCIENCES; REMOTE SENSING; EL NINO; ATMOSPHERIC CIRCULATION; WATER WAVES...