The actual temperature record: The global mean temperature is approximately 0.5 degrees Celsius higher than it was a century ago. Based on surface readings, the temperature rose prior to 1940, perhaps in response to the end of the little ice age, which lasted until the 19th century. From about 1940 until about 1975, the temperature dropped, sparking the above-mentioned global cooling scare. More recently the temperature has been rising again, sparking concerns about global warming.
The accuracy of the surface temperature record must be kept in mind when evaluating trends measured in fractions of a degree. One significant problem is the extent to which the data may be skewed as a result of urbanization. Atmospheric physicist Dr. S. Fred Singer wrote in a letter that appeared in the May issue of Science: "The post-1940 global warming claimed by the IPCC comes mainly from distant surface stations and from tropical sea surface readings, with both data sets poorly controlled (in both quality and location)." On the other hand, "surface data from well-controlled U.S. stations (after removing the urban ‘heat-island’ effects) show the warmest years as being around 1940." In his testimony to the Senate Commerce Committee on July 18th of last year, Singer bluntly stated: "The post-1980 global warming trend from surface thermometers is not credible."
Dr. Singer, who established the U.S. Weather Satellite Service and served as its first director, is just one of many scientists who believe that temperature data collected by weather satellites provides a far better measuring stick than the surface readings. After all, the satellite data is truly global, and it is not skewed by the urban heat effect. The satellite data from January 1979 (when this data first became available) through May 2001 shows a warming trend of 0.038 degrees Celsius per decade — or less than four-tenths of one degree per century. This minuscule rate of increase, which could change, is far less than the dramatic increases in temperature the forecasters of doom have been warning against.
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The accuracy of the surface temperature record must be kept in mind when evaluating trends measured in fractions of a degree. One significant problem is the extent to which the data may be skewed as a result of urbanization. Atmospheric physicist Dr. S. Fred Singer wrote in a letter that appeared in the May issue of Science: "The post-1940 global warming claimed by the IPCC comes mainly from distant surface stations and from tropical sea surface readings, with both data sets poorly controlled (in both quality and location)." On the other hand, "surface data from well-controlled U.S. stations (after removing the urban ‘heat-island’ effects) show the warmest years as being around 1940." In his testimony to the Senate Commerce Committee on July 18th of last year, Singer bluntly stated: "The post-1980 global warming trend from surface thermometers is not credible."
Dr. Singer, who established the U.S. Weather Satellite Service and served as its first director, is just one of many scientists who believe that temperature data collected by weather satellites provides a far better measuring stick than the surface readings. After all, the satellite data is truly global, and it is not skewed by the urban heat effect. The satellite data from January 1979 (when this data first became available) through May 2001 shows a warming trend of 0.038 degrees Celsius per decade — or less than four-tenths of one degree per century. This minuscule rate of increase, which could change, is far less than the dramatic increases in temperature the forecasters of doom have been warning against.
More Here
