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A comment on The Argument Against Terraforming Mars (2016). Parent comment

Re:The Argument Against Terraforming Mars (2016) by jdietrich on Sunday June 04, 2017 @08:51AM (#14481272)
Mars has useful quantities of ice and an atmosphere that's 96% CO2. We wouldn't need to export any oxygen to Mars and probably wouldn't need to export much or any water either. Really, the biggest doubt is about the quantity of readily-available nitrogen.

On the grandest scale, we could take CO2 from Venus and hydrogen from Saturn or Jupiter. The logistics aren't exactly straightforward, but the quantities available are immense.

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Re:The Argument Against Terraforming Mars (2016) by Numberwang on Sunday June 04, 2017 @11:54AM (#14482128)
I think what he means is any atmosphere on mars would eventually blow away, just like it did the first time.
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Re:The Argument Against Terraforming Mars (2016) by jnicholasp on Sunday June 04, 2017 @12:50PM (#14482338)
Over millions and millions of years. A civilization that could colonize another planet could manage to mitigate or outright solve that kind of problem with that kind of time.
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Re:The Argument Against Terraforming Mars (2016) by alan-crowe on Monday June 05, 2017 @11:04AM (#14488098)
https://phys.org/news/2017-03-nasa-magnetic-shield-mars-atmo...

The idea is that shielding Mars from the solar wind would allow out-gassing to rebuild the Martian atmosphere.

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