Monday, March 03, 2008
Global Cooling - Brrrrrr!
http://www.nytimes.com/2008/03/02/science/02cold.html?_r=1&oref=slogin
Skeptics on Human Climate Impact Seize on Cold Spell
By ANDREW C. REVKIN
Published: March 2, 2008
The world has seen some extraordinary winter conditions in both hemispheres over the past year: snow in Johannesburg last June and in Baghdad in January, Arctic sea ice returning with a vengeance after a record retreat last summer, paralyzing blizzards in China, and a sharp drop in the globe's average temperature.
It is no wonder that some scientists, opinion writers, political operatives and other people who challenge warnings about dangerous human-caused global warming have jumped on this as a teachable moment.
"Earth's 'Fever' Breaks: Global COOLING Currently Under Way," read a blog post and news release on Wednesday from Marc Morano, the communications director for the Republican minority on the Senate Environment and Public Works Committee.
So what is happening?
According to a host of climate experts, including some who question the extent and risks of global warming, it is mostly good old-fashioned weather, along with a cold kick from the tropical Pacific Ocean, which is in its La Niña phase for a few more months, a year after it was in the opposite warm El Niño pattern.
If anything else is afoot - like some cooling related to sunspot cycles or slow shifts in ocean and atmospheric patterns that can influence temperatures - an array of scientists who have staked out differing positions on the overall threat from global warming agree that there is no way to pinpoint whether such a new force is at work.
Many scientists also say that the cool spell in no way undermines the enormous body of evidence pointing to a warming world with disrupted weather patterns, less ice and rising seas should heat-trapping greenhouse gases from burning fossil fuels and forests continue to accumulate in the air.
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