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Some people think that the clouds are the product of global warming. The heat is causing water vapor to drift higher before it condenses. Others say it's more pollutants and dust in the atmosphere, making more visible clouds form at higher levels. There's also the possibility that people had always seen noctilucent clouds, but that the eruption from it made them more dramatic. Since they've acquired a name, more attention has been called to them. In any case, they're very pretty. And a little eerie.
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