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In 1989, a NASA scientist and leading researcher on global warming projected that the Earth's average temperature would increase by 3.6 degrees Fahrenheit "by the year 2020." What was the actual increase?

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In 1989, Dr. David Rind of NASA's Goddard Institute for Space Studies wrote that his agency's "model's forecast" predicts an average global temperature increase of 3.6 degrees F "by the year 2020." According to both ground-level data from the Goddard Institute and satellite data from the National Space Science and Technology Center, Earth's average global temperature increased by about 0.7 degrees F between the 1980s and the decade that ended in 2020. This was one-fifth of Rind's 1989 projection.

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