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Although we can't see it, air is vital to our existence. It serves as a blanket that retains warmth from the sun, supports all life on earth, and holds clouds and water vapor that produce rain. More than 40000 thunderstorms occur around the world each day. The Atmospheric Radiation Measurement Program has equipment in three locations of vastly different climates around the world.
![Although we can\](http://i.ytimg.com/vi/aNL-VNfdUdM/2.jpg "Although we can\")
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