Sign of Global Warming Found in Atmosphere

From Times Staff and Wire Reports

Researchers at Lawrence Livermore National Laboratory cited new evidence that humans are changing the climate. The tropopause, the zone separating the turbulent lower section of the atmosphere from the more stable stratosphere, has heightened over the last two decades.

In a study published Friday in the Journal of Geophysical Research, scientists said the cause was warming of the troposphere by greenhouse gases and cooling of the stratosphere caused by depletion of ozone.

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