PerspectivePlanetary Science

Global Change on Mars?

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Science  07 Dec 2001:
Vol. 294, Issue 5549, pp. 2107-2108
DOI: 10.1126/science.1067542

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The martian atmosphere is made up almost entirely of carbon dioxide. Observations and models show that this carbon dioxide forms seasonal deposits at the martian poles. In his Perspective, Paige highlights the reports by Malin et al. and by Smith et al., who analyze newly acquired spacecraft observations that show that Mars' highly dynamic present-day carbon dioxide cycle may change from one year to the next.