When the effects are calculated in a standard climate model, the result is a reduction in average temperature of 0.00005oC (one twenty-thousandth of a degree Celsius, or one ten-thousandth of a degree Fahrenheit).

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And the benefits, when estimated using a standard climate model, will reduce temperature only by an immeasurable one-tenth of a degree Fahrenheit by the end of the century.

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It remains unknown where the segment fit into the wing, but it included reinforced carbon-carbon material, which protects the leading edge of shuttle wings from the 3, 000-degree Fahrenheit heat of atmospheric re-entry.

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Eighth of a degree Fahrenheit warmer?

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Since 1984, tropical waters in the Northern Hemisphere have warmed at a rate of about 1 degree Fahrenheit per decade, according to data compiled by NOAA. This figure is 10 times the global rate, a harbinger of climate change.

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The range in normal temperatures can fluctuate as much as 1 degree Fahrenheit over the course of a day.

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At the bottom of the Knotty Head hole, the 450-degree-Fahrenheit temperature and the pressure (2, 000 times atmospheric) would crush or melt most drilling tools.

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IPCC's worst-case scenario, which is about a 7 degree Fahrenheit rise in temperature, shows a global sea level gain of 10 to 23 inches.

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"Six Degrees", by leading environmental campaigner Mark Lynas, sounds a red alert for the health of the planet, charting degree-by-degree the likely consequences of rising temperatures up to the worst-case scenario 5.8 degrees Celsius (10 degrees Fahrenheit) rise envisaged by the Intergovernmental Panel on Climate Change's 2001 report.

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