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Inventory of CO2 available for terraforming Mars


We revisit the idea of ‘terraforming’ Mars — changing its environment to be more Earth-like in a way that would allow terrestrial life (possibly including humans) to survive without the need for life-support systems — in the context of what we know about Mars today. We want to answer the question of whether it is possible to mobilize gases present on Mars today in non-atmospheric reservoirs by emplacing them into the atmosphere, and increase the pressure and temperature so that plants or humans could survive at the surface. We ask whether this can be achieved considering realistic estimates of available volatiles, without the use of new technology that is well beyond today’s capability. Recent observations have been made of the loss of Mars’s atmosphere to space by the Mars Atmosphere and Volatile Evolution Mission probe and the Mars Express spacecraft, along with analyses of the abundance of carbon-bearing minerals and the occurrence of CO2 in polar ice from the Mars Reconnaissance Orbiter and the Mars Odyssey spacecraft. These results suggest that there is not enough CO2 remaining on Mars to provide significant greenhouse warming were the gas to be emplaced into the atmosphere; in addition, most of the CO2 gas in these reservoirs is not accessible and thus cannot be readily mobilized. As a result, we conclude that terraforming Mars is not possible using present-day technology.

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Fig. 1

adapted from ref. 16, Elsevier

Fig. 2: A high-resolution image from the HiRISE (High-Resolution Imaging Science Experiment), with a false-colour compositional image from the CRISM (Compact Reconnaissance Imaging Spectrometer for Mars) superimposed on it.

NASA/JPL-Caltech/JHUAPL/Univ. of Arizona

Fig. 3


  1. Sagan, C. The long winter model of Martian biology: A speculation. Icarus 15, 511–514 (1971).

    Article  ADS  Google Scholar 

  2. McKay, C. P., Toon, O. B. & Kasting, J. F. Making Mars habitable. Nature 352, 489–496 (1991).

    Article  ADS  Google Scholar 

  3. Musk, E. Becoming a multi-planet species. International Astronautical Congress (2017);

  4. Lovelock, J. & Allaby, M. Greening of Mars (Warner Books, New York, 1985).

    Google Scholar 

  5. Gerstell, M. F., Francisco, J. S., Yung, Y. L., Boxe, C. & Aaltonee, E. T. Keeping Mars warm with new super greenhouse gases. Proc. Natl Acad. Sci. USA 98, 2154–2157 (2001).

    Article  ADS  Google Scholar 

  6. Marinova, M. M., McKy, C. P. & Hashimoto, H. Radiative-convective model of warming of Mars with artificial greenhouse gases. J. Geophys. Res. (2005).

  7. Ramirez, R. M. et al. Warming early Mars with CO2 and H2. Nat. Geosci. 7, 59–63 (2014).

    Article  ADS  Google Scholar 

  8. James, P. B., Kieffer, H. H. & Paige, D. A. in Mars (eds Kieffer, H. H. et al.) 934–968 (Univ. Arizona Press, Tucson, 1992).

  9. Thomas, P., Squyres, S., Herkenhoff, K., Howard, A. & Murray, B. in Mars (eds Kieffer, H. et al.) 767–795 (Univ. Arizona Press, Tucson, 1992).

  10. Phillips, R. J. et al. Massive CO2 ice deposits sequestered in the south polar layered deposits of Mars. Science 332, 838–841 (2011).

    Article  ADS  Google Scholar 

  11. Bierson, C. J. et al. Stratigraphy and evolution of the buried CO2 deposit in the Martian south polar cap. Geophys. Res. Lett. 43, 4172–4179 (2016).

    Article  ADS  Google Scholar 

  12. Hobbs, P. V. Ice Physics (Clarendon, Oxford, 1974).

  13. Dobrovolskis, A. & Ingersoll, A. P. Carbon dioxide–water clathrate as a reservoir of CO2 on Mars. Icarus 26, 353–357 (1975).

    Article  ADS  Google Scholar 

  14. Stewart, S. T. & Nimmo, F. Surface runoff features on Mars: Testing the carbon dioxide formation hypothesis. J. Geophys. Res. 107, 7–12 (2002).

    Article  Google Scholar 

  15. Sagan, C. Liquid carbon dioxide and the Martian polar laminas. J. Geophys. Res. 78, 4250–4251 (1973).

    Article  ADS  Google Scholar 

  16. Zent, A. P., Fanale, F. P. & Postawko, S. E. Carbon dioxide: Adsorption on palagonite and partitioning in the Martian regolith. Icarus 71, 241–249 (1987).

    Article  ADS  Google Scholar 

  17. Jänchen, J., Morris, R. V., Bish, D. L., Janssen, M. & Hellwig, U. The H2O and CO2 adsorption properties of phyllosilicate-poor palagonitic dust and smectites under martian environmental conditions. Icarus 200, 463–467 (2009).

    Article  ADS  Google Scholar 

  18. Christensen, P. R. Regional dust deposits on Mars: Physical properties, age, and history. J. Geophys. Res. 91, 3533–3545 (1986).

    Article  ADS  Google Scholar 

  19. Cannon, K. M., Parman, S. W. & Mustard, J. F. Primordial clays on Mars formed beneath a steam or supercritical atmosphere. Nature 552, 88–91 (2017).

    Article  ADS  Google Scholar 

  20. Ehlmann, B. L. & Edwards, C. S. Mineralogy of the Martian surface. Annu. Rev. Earth Planet. Sci. 42, 291–315 (2014).

    Article  ADS  Google Scholar 

  21. Pollack, J. B., Kasting, J. F., Richardson, S. M. & Poliakoff, K. The case for a wet, warm climate on early Mars. Icarus 71, 203–224 (1987).

    Article  ADS  Google Scholar 

  22. Kahn, R. The evolution of CO2 on Mars. Icarus 62, 175–190 (1985).

    Article  ADS  Google Scholar 

  23. Niles, P. B. et al. Geochemistry of carbonates on Mars: Implications for climate history and nature of aqueous environments. Space Sci. Rev. 174, 301–328 (2013).

    Article  ADS  Google Scholar 

  24. Edwards, C. S. & Ehlmann, B. L. Carbon sequestration on Mars. Geology 43, 863–866 (2015).

    Article  ADS  Google Scholar 

  25. Wray, J. J. et al. Orbital evidence for more widespread carbonate-bearing rocks on Mars. J. Geophys. Res. Planets 121, 652–677 (2016).

    Article  ADS  Google Scholar 

  26. Bandfield, J. L., Glotch, T. D. & Christensen, P. R. Spectroscopic identification of carbonate minerals in the Martian dust. Science 301, 1084–1086 (2003).

    Article  ADS  Google Scholar 

  27. Michalski, J. R. & Niles, P. B. Deep crustal carbonate rocks exposed by meteor impact on Mars. Nat. Geosci. 3, 751–755 (2010).

    Article  ADS  Google Scholar 

  28. Lundin, R. et al. Solar forcing and planetary ion escape from Mars. Geophys. Res. Lett. 35, 09203 (2008).

    Article  ADS  Google Scholar 

  29. Jakosky, B. M. et al. Loss of the Martian atmosphere to space: Present-day loss rates determined from MAVEN observations and integrated loss through time. Icarus (in the press).

  30. Luhmann, J. G., Johnson, R. E. & Zhang, M. H. G. Evolutionary impact of sputtering of the Martian atmosphere by O+ pickup ions. Geophys. Res. Lett. 19, 2151–2154 (1992).

    Article  ADS  Google Scholar 

  31. Chassefiere, E., Langlais, B., Quesnel, Y. & Leblanc, F. The fate of early Mars’ lost water: The role of serpentinization. J. Geophys. Res. 118, 1123–1134 (2013).

    Article  Google Scholar 

  32. Jakosky, B. M. Mars volatile evolution: Evidence from stable isotopes. Icarus 94, 14–31 (1991).

    Article  ADS  Google Scholar 

  33. Webster, C. R. et al. Isotope ratios of H, C, and O in CO2 and H2O of the Martian atmosphere. Science 341, 260–263 (2013).

    Article  ADS  Google Scholar 

  34. Phillips, R. J. et al. Ancient geodynamics and global-scale hydrology on Mars. Science 291, 2587–2591 (2001).

    Article  ADS  Google Scholar 

  35. Jakosky, B. M. et al. Mars’ atmospheric history derived from upper-atmosphere measurements of 38Ar/36Ar. Science 355, 1408–1410 (2017).

    Article  ADS  MathSciNet  Google Scholar 

  36. Mole, R. A. Terraforming Mars with four war-surplus bombs. J. Brit. Interplanet. Soc. 48, 321–324 (1995).

    Google Scholar 

  37. Leopold, T. Elon Musk’s new idea: Nuke Mars. CNN (2015);

  38. Green, J. L. et al. A future Mars environment for science and exploration. Planetary Visions 2050 Workshop 1989 (2017).

  39. Greeley, R. & Schneid, B. D. Magma generation on Mars: Amounts, rates, and comparisons with Earth, Moon, and Venus. Science 254, 996–998 (1991).

    Article  ADS  Google Scholar 

  40. Tanaka, K. L. The stratigraphy of Mars. J. Geophys. Res. 91, E139–E158 (1986).

    Article  ADS  Google Scholar 

  41. Jakosky, B. M. & Shock, E. L. The biological potential of Mars, the early Earth, and Europa. J. Geophys. Res. 103, 19359–19364 (1998).

    Article  ADS  Google Scholar 

  42. Carr, M. H. Recharge of the early atmosphere of Mars by impact-induced release of CO2. Icarus 79, 311–327 (1989).

    Article  ADS  Google Scholar 

  43. Kasting, J. F. CO2 condensation and the climate of early Mars. Icarus 94, 1–13 (1991).

    Article  ADS  Google Scholar 

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This research was supported in part by NASA through the MAVEN and Mars Odyssey Thermal Emission Imaging System (THEMIS) projects. Thoughtful comments from M. Marinova are appreciated.

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B.M.J. carried out the atmospheric analyses and C.S.E. carried out the surface/subsurface analyses. Both authors contributed to the volatile inventory, integration and writing.

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Correspondence to Bruce M. Jakosky.

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The authors declare no competing interests.

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Jakosky, B.M., Edwards, C.S. Inventory of CO2 available for terraforming Mars. Nat Astron 2, 634–639 (2018).

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