Explosive allegations of data manipulation at US government climate data centres have been aired in a special report on the website of KUSI News, based in San Diego, United States. These claims are based on research by computer programmer E. Michael Smith and meteorologist Joseph D'Aleo, who say that world temperature observations have been substantially manipulated to support claims of global warming.
According Smith and D'Aleo, the US national temperature dataset has been manipulated in a number of ways. In about 1990, readings from thermometers around the world had been excluded, reducing the total number of thermometers used in the dataset from 6000 to 1500. Readings from thermometers in cold places were substituted with ones from elsewhere, as E. Michael Smith explains:
Smith: One of the more startling ones I ran into was Bolivia. There is a very wonderful baseline for Bolivia, a very high and mountainous country, right up until 1990 when the data ends, and if you look on the November 2009 anomaly map, you'll see a very red, rosy, hot Bolivia. How do you get a hot Bolivia when you haven't measured the temperature for 20 years?
Coleman: Well, how do you?
Smith: They take the temperature from places up to 1,200 kilometres away and copy it in, they fill in with what they've got. And what they've got is the beach in Peru and the Amazon jungle.
Also, adjustments were applied to the raw data to produce a warming trend where none existed, as in the case of Davis, California, which appears to be warming in the adjusted data but shows cooling in the non-adjusted data:
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