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ming trend occurring only due to natural events is estimated to be less than 1 percent for the land and 3 percent for the oceans. Furthermore, the stratosphere has indeed been cooling during the last 30 years, an important manifestation of the greenhouse effect" (2:3).

Many problems inherent in the collection of temperature data make the conclusions drawn from such research questionable. Modern data tend to be more accurate than some historical data. Most weather stations are near urban areas, which sometimes act as "heat islands." Air temperatur

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