World Health Organization
Climate variability is the variation around the average climate, including seasonal variations as well as large-scale variations in atmospheric and ocean circulation such as the EI Nino/Southern Oscillation (ENSO). Climate change operates over decades or longer. Changes in climate occur as a result of internal variability within the climate system and external
factors (natural and anthropogenic). Although climate is always changing, over the past 10,000 years it has been both relatively stable and warm.
Call Number: [EL]