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I think you are misunderstanding the argument. I am not talking about doing anything to Mars’ atmosphere, I am responding to Topher Allans:

“…find some way of bringing the CO2 into your pressurised living space. Given the huge pressure differential, that’d be difficult.”

In this case, we are talking about pumping CO2 across a 14.9 psi pressure gradient, into a greenhouse pressurized at 15psi. This is not very much pressure in absolute terms, less than a car or bicycle tire for instance, and has nothing to do with the size of the atmosphere or the greenhouse, except for the amount of time it would take to pump.

27 days ago on Star search: a non-profit group wants to send four people to Mars... forever 1 recommend

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Sure, but earth’s atmosphere is about 15psi, so the differential on Mars is by definition less than 15psi. 15psi really isn’t that much compared to a submarine for instance which could have 300+ psi pressure, or my bicycle tire which has 110 psi pressure, or a typical car tire which has 32 psi pressure.

28 days ago on Star search: a non-profit group wants to send four people to Mars... forever 2 replies

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“They will live as equals at first, remember this is being monitored at all times, if someone goes insane they’ll be pulled. "

How would this “being pulled” work?

28 days ago on Star search: a non-profit group wants to send four people to Mars... forever 1 reply 1 recommend

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I think the first group should be older people with no intentions of reproducing. The first group would need to kickstart some kind of sustainable ecosystem before thinking about sending younger people who want to have kids.

28 days ago on Star search: a non-profit group wants to send four people to Mars... forever 1 reply

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There isn’t a huge pressure differential, less that 1 atmosphere. A bicycle pump would do the job (slowly).

28 days ago on Star search: a non-profit group wants to send four people to Mars... forever 1 reply