How do human activitiescause changes in the composition and structure of the atmosphere?
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Explanation:
Human activity has very different effects on the temperature of the upper and lower atmosphere, and a very different fingerprint from purely natural influences," said Benjamin Santer, the lead researcher in the paper appearing in the Sept.16 online edition of the Proceedings of the National Academy of Sciences. "Our results provide clear evidence for a discernible human influence on the thermal structure of the atmosphere."
Observational satellite data and the computer model-predicted response to human influence have a common latitude/altitude pattern of atmospheric temperature change. The key features of this pattern are global-scale tropospheric warming and stratospheric cooling over the 34-year satellite temperature record. (The troposphere is the lowest portion of Earth's atmosphere. The stratosphere lies above the troposphere.)
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