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The “Steven Goddard Real Science” blog compares the raw U.S. temperature records from the Energy Department’s United States Historical Climatology Network to the “final” processed figures, to demonstrate how the historical data have been “corrected,” using computer modeling.

The modifications made to the past temperature record had the effect of cooling the 20th century, which makes temperatures over the last 14 years appear much warmer by comparison. Such changes don’t square with history, which shows the decade of the 1930s the hottest on record. The Dust Bowl storms were so severe they sent clouds of debris from Texas and Oklahoma to the East Coast, even darkening the skies over the U.S. Capitol one day in 1934.

In an inconvenient article from 1999, written before the data had been “corrected,” James Hansen, then a NASA scientist, acknowledged that the climate had held steady after the Dust Bowl storms. “In the U.S.,” wrote Mr. Hansen, “there has been little temperature change in the past 50 years, the time of rapidly increasing greenhouse gases — in fact, there was a slight cooling throughout much of the country.” Mr. Hansen, recognized as a godfather of the global warming doomcriers, then predicted that the first decade of the 21st century would be even hotter than the 1930s.

To produce this hotter result, the scientists “adjusted” the temperature records to make it appear so. NASA redrew the temperature chart Mr. Hansen used in 1999, and the new chart shows a dramatically cooled 1930s. The 1990s that Mr. Hansen once said were not so hot became warmer than the 1930s.