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An impact of climate change is natural disasters - ( hurricanes, tsunamis, earthquakes ) are happening ( five times, three times, twice ) as often as they used to ( 100, 50, 200 ) years ago due to rising sea temperatures. The annual number of North Atlantic tropical storms has risen from ( 9, 12, 5 ) (1990) to ( 20, 15, 17 ) (1998).