This could be an unmistakable sign of intelligent life driving SUV’s:

Mars’ southern polar ice cap is believed to erupt in a violent fit of heated gas every spring in a process that helps explain why the Red Planet has dark spots in that region, scientists said Wednesday.

Jets of carbon dioxide gas burst from the ice cap as it warms every spring, carrying dark sand and dust that fall back to the surface as dark splotches, concluded Phil Christensen of Arizona State University, who analyzed images from NASA’s Odyssey orbiter.

The question of what will be the subject for the film ”An Inconvenient Truth II“ has become a no-brainer. 


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