For a long time, it seemed that Antarctica was immune to global warming. But a new analysis of satellite and weather station data has shown that Antarctica has warmed on average since 1957.
These images show temperature trends in two thick layers of the atmosphere as measured by a series of satellite-based instruments between January 1979 and December 2005.
New research from NASA scientists shows that the amount of chlorine in the stratosphere over the South Pole is declining at the same time that ozone holes are becoming less severe.