Aug. 28, 2007 — "We have met the enemy, and he is us," the comic-strip character Pogo said decades ago. A new analysis of last year's near-record temperatures in the United States suggests he was right.
Warming caused by human activity was the biggest factor in the high temperatures recorded in 2006, according to a report by researchers at the National Oceanic and Atmospheric Administration.
The analysis, released Tuesday, is being published in the September issue of Geophysical Research Letters, published by the American Geophysical Union.
In January, NOAA's National Climatic Data Center reported that 2006 was the warmest year on record over the 48 contiguous states with an average temperature 2.1 degrees Fahrenheit warmer than normal and 0.07 degree warmer than 1998, the previous warmest year on record.
In May, however, NOAA revised the 2006 ranking to the second warmest year after updated statistics showed the year was actually .08 F cooler than 1998.
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At the time the agency said it was not clear how much of the warming was a result of greenhouse-gas induced climate change and how much resulted from the El Nino warming of the tropical Pacific Ocean that was under way.
"We wanted to find out whether it was pure coincidence that the two warmest years on record both coincided with El Nino events," Martin Hoerling of NOAA's Earth System Research Laboratory in Boulder, Colo., said in a statement.
