http://www.nytimes.com/2007/01/10/science/10climate.html?_r=2&ref=us&oref=slogin&oref=sloginPresident Bush has said it.
A lot of government scientists have said it.
But until yesterday, it appeared that no news release on annual climate trends out of the National Oceanic and Atmospheric Administration under the Bush White House had said unequivocally that a buildup of greenhouse gases was helping warm the climate.
The statement came in a release that said 2006 was the warmest year for the 48 contiguous states since regular temperature records began in 1895. It surpassed the previous champion, 1998, a year heated up by a powerful episode of the periodic warming of the tropical Pacific Ocean by El Niño. Last year, another El Niño developed, but this time a long-term warming trend from human activities was said to be involved as well.
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