Don't let the climate doubters fool you

By Alan I. Leshner
WashPost
Wednesday, December 9, 2009 6:48 PM

Don't be fooled about climate science. In April, 1994 -- long after scientists had clearly demonstrated the addictive quality and devastating health impacts of cigarette smoking -- seven chief executives of major tobacco companies denied the evidence, swearing under oath that nicotine was not addictive.

Now, the American public is again being subjected to those kinds of denials, this time about global climate change. While former Alaska governor Sarah Palin wrote in her Dec. 9 op-ed that she did not deny the "reality of some changes in climate," she distorted the clear scientific evidence that Earth's climate is changing, largely as a result of human behaviors. She also badly confused the concepts of daily weather changes and long-term climate trends when she wrote that "while we recognize the occurrence of these natural, cyclical environmental trends, we can't say with assurance that man's activities cause weather changes." Her statement inaccurately suggests that short-term weather fluctuations must be consistent with long-term climate patterns. And it is the long-term patterns that are a cause for concern.

Climate-change science is clear: The concentration of atmospheric carbon dioxide -- derived mostly from the human activities of fossil-fuel burning and deforestation -- stands at 389 parts per million (ppm). We know from studying ancient Antarctic ice cores that this concentration is higher than it has been for at least the past 650,000 years. Exhaustive measurements tell us that atmospheric carbon dioxide is rising by 2 ppm every year and that the global temperature has increased by about 1.1 degrees Fahrenheit over the past century. Multiple lines of other evidence, including reliable thermometer readings since the 1880s, reveal a clear warming trend. The broader impacts of climate change range from rapidly melting glaciers and rising sea levels to shifts in species ranges.

(More here.)

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