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Jan. 28, 2008: Last Year Ranks Among Warmest Years on Record

January 28, 2008
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NEW YORK and WASHINGTON - The year 2007 was either the second-warmest or fifth-warmest year on record for the globe, depending on which group of researchers you listen to. The Goddard Institute of Space Studies (GISS), a part of the National Aeronautics and Space Administration (NASA), claims that 2007 ties with 1998 as the second-warmest year on record, but the National Climatic Data Center, a part of the National Oceanic and Atmospheric Administration (NOAA), puts 2007 in fifth place. And to muddle things further, the two agencies use different baselines for comparison: GISS says 2007 was 1.026°F above the mean temperature for 1951-1980, while NOAA says 2007 was 0.99°F above the average temperature for the entire 20th century.

Regardless of the rankings, the two agencies agree that the eight warmest years on record have all occurred since 1998, making the past decade a clear record-breaker. And as GISS notes, the warmth in 2007 occurred despite solar irradiance (the amount of energy Earth receives from the sun) reaching a minimum and a strong La Nina episode (a cooling in the equatorial region of the Pacific Ocean) developing late in the year, both factors that would tend to push down global temperatures. The year started with a warming boost from an El Nino event, which is a warming in the equatorial region of the Pacific Ocean, but that phenomenon faded quickly, confounding some predictions for 2007 to be a record-breaking year.

Publication date: 01/28/2008

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