Climate Change and Desertification
At continental, regional, and ocean basin scales, numerous long-term changes in climate have been observed. These include changes in Arctic temperatures and ice, widespread changes in precipitation amounts, ocean salinity, wind patterns and aspects of extreme weather including droughts, heavy precipitation, heat waves and the intensity of tropical cyclones. More intense and longer droughts have been observed over wider areas since the 1970s, particularly in the tropics and subtropics.
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