Warming of Earth's Troposphere Confirmed. AFP, May 27, 2008. "Climate change models predicting a dangerous warming of the world's atmosphere got a confirming boost Sunday from a study showing parallel trends at altitudes nearly twice as high as Mount Everest... Over the last two decades, temperature readings from the upper troposphere -- 12 to 16 kilometers (7.5 to 10 miles) above Earth's surface -- based on data gathered by satellites and high-flying weather balloons, showed little or no increase. Oft-cited by climate change skeptics, these findings were known to be flawed but still challenged the validity of computer models predicting warming trends at these altitudes, especially over the tropics. In the new study, climate scientists Robert Allen and Steven Sherwood of Yale University use a more accurate method to show that temperature changes in the upper troposphere since 1970 -- about 0.65 degrees C per decade -- are in fact clearly in sync with most climate change models. Rather than measuring temperature directly, which had yielded inconsistent results, they used wind variations as a proxy."
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