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A clear change in salinity has been detected in the world's oceans during the past 50 years, signaling shifts and acceleration in the global rainfall and evaporation cycle tied directly to climate change. These changes suggest that arid regions have become drier and high rainfall regions have become wetter in response to observed global warming. Scientists monitor salinity changes in the world's oceans to determine where rainfall has increased or decreased. [Source: Lawrence Livermore National Laboratory]
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