Mars is one big dustball, and lately it's been swirling in the wind.
Mother Nature keeps sweeping the floor there to kick up dust, and the global temperature, as a result, keeps rising. (It doesn't get any cleaner for her nonstop tidying efforts, either, which doesn't alleviate the temperature rise on the Red Planet.)
Incidentally, because its dry, desert landscape is unlike Earth's, the two planet's are undergoing warming but for drastically different reasons.
For more on Mars, including global dust storms and dust devils:
http://sciencenow.sciencemag.org/cgi/content/full/2007/404/4
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