Images from Themis (Thermal Emission Imaging System) have shown for a number of years that there are active geysers on the surface of Mars. Fans of material spreading from the surface from single points all in the same direction indicate that great jets of carbon dioxide are being ejected from the surface on a scale unseen on Earth.
It is believed that the sun warming the ice on the polar caps turned the frozen carbon dioxide underground into high pressure gas, sending it through the surface. The article was published in nature I have not read the technical papers on the subject, so you can decide on the credibility of the details.
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