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Acording to a NASA web page 70% of the earth is covered by clouds. "Everyone knows what a cloud looks like, but scientists need to know what percentage of clouds cover the Earth everyday, in order to make their computer climate models and weather forecast computer models work better. ICESat [satellite] has provided the most accurate figure to date, and tells us that 70 percent of the world is cloud covered. Previous estimates ranged from 50 to 75 percent. "

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