Mars' polar ice caps are slowly melting.
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References
Malin, M. C., Caplinger, M. A. & Davis, S. D. Observational evidence for an active surface reservoir of solid carbon dioxide on Mars.Science 294, 2146 - 2148 (2001).
Smith, D. E., Zuber, M. T. & Neumann, G. A. Seasonal variations of snow depth on Mars.Science 294, 2141 - 2146 (2001).
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Ball, P. Mars takes its cap off. Nature (2001). https://doi.org/10.1038/news011213-1
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DOI: https://doi.org/10.1038/news011213-1