Red planet's poles are mostly frozen water, not carbon dioxide.
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References
Byrne, S. & Ingersoll, A. P. A sublimation model for martian south polar ice features. Science, 299, 1051 - 1053, (2003).
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Ball, P. Mars gets new icing. Nature (2003). https://doi.org/10.1038/news030210-9
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DOI: https://doi.org/10.1038/news030210-9