Atmosphère - NASA - GEOS-5 Aerosols 2006 - 2007

Satellites, balloon-borne instruments and ground-based devices make 30 million observations of the atmosphere each day. Yet these measurements still give an incomplete picture of the complex interactions within Earth's atmosphere. Enter climate models. Through mathematical experiments, modelers can move Earth forward or backward in time to create a dynamic portrait of the planet.

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Source :: http://www.youtube.com/watch?v=oRsY_UviBPE