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Climate change is any long-term significant change in the “average weather” that a given region experiences. Average weather may include average temperature, precipitation and wind patterns. It involves changes in the variability or average state of the atmosphere over duration ranging from decades to millions of years. These changes can be caused by dynamic processes on Earth, external forces including variations in sunlight intensity, and more recently by human activities. In recent usage,... full article at wikipedia
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Topic History

Created by Metaweb Oct 22, 2006
Last edited by frankieroberto Jun 30, 2008

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