First let's do a simple test of this hypothesis: All 12 year old boys weigh an average of 100 lbs. based on the following: 10 boys at 100lbs average: 100 lbs. But what happens if one of the 10 boys is overweight .. 300 lbs! All 12 year old boys including the 300 lb average 120 lbs! So it would be wrong to draw conclusion that ALL 12 year old boys weigh an average of 100lbs IF the 300 lb boy is excluded.. RIGHT??? How does this relate to global warming.. The IEA said it was necessary to recalculate all global-temperature data in order to assess the scale of such exaggeration. "The number of [Siberian ] stations increased from 8 in 1901 to 23 in 1951 and then decreased to 12 from 1989 to present. Only four stations, those at Irkutsk, Bratsk, Chita and Kirensk, cover the entire 20th century. IEA analysts say climatologists use the data of stations located in large populated centers that are influenced by the urban-warming effect more frequently than the correct data of remote stations The scale of global warming was exaggerated due to temperature distortions for Russia accounting for 12.5% of the worlds land mass. The IEA said it was necessary to recalculate all global-temperature data in order to assess the scale of such exaggeration. Climategatekeeping: Siberia « Climate Audit So the basis for global warming has been the record keeping of temperature stations around the earth..except for 12.5% of the Earth's surface and those temperatures were NOT included!