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Scientists at two of the world’s leading climate centres - NASA and NOAA - have been caught out manipulating temperature data to overstate the extent of the 20th century "global warming".
The evidence of their tinkering can clearly be seen at Real Science, where blogger Steven Goddard has posted a series of graphs which show "climate change" before and after the adjustments.
When the raw data is used, there is little if any evidence of global warming and some evidence of global cooling. However, once the data has been adjusted - ie fabricated by computer models - 20th century 'global warming' suddenly looks much more dramatic.
This is especially noticeable on the US temperature records. Before 2000, it was generally accepted
Error in NASA climate data sparks debate
Due to an error in calculations of mean U.S. temperatures, 1934, not 1998 as previously reported, is the hottest year on record in the United States. NASA scientists contend that the error has little effect on overall U.S. temperature trends and no effect on global mean temperatures, with 2005 still the hottest year worldwide by far, followed by 1998. The data corrections have added new fuel to the climate change debate, however — and could spell more public relations woes for NASA.
Climate scientists, however, are asserting that the uproar over the data corrections is nothing more than a tempest in a teapot. NASA GISS scientist Jim Hansen, who helped devise the algorithm used to correct for the various climate factors, wrote in an Aug. 10 e-mail that the errors were introduced when the U.S. stations switched between two different datasets in 2000, with the faulty assumption that the second dataset also included the necessary corrections, an error that was recognized and fixed, Hansen said. Acknowledging that 1934 now appears to have been slightly hotter than 1998 in the United States, he noted that the difference in the mean between the two years, of 0.02 degrees Celsius, was and always had been smaller than the uncertainty, although their relative positions are now flipflopped. Globally, however, the changes had no effect on rankings, and 1998 was still by far the warmest year on record before 2005, he says. "For two days I have been besieged by rants that I have wronged the president, that I must 'step down,' or that I must 'vanish,'" he wrote.
I've lost count how many times "scientists" have been caught manipulating data and blackballing opposing ideas.