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Most of all the articles about Mars terraforming focuses on warming the atmosphere. 2nd most popular topic as far as I know is the magnetic field that Mars lacks. Some other sources speak about toxic soil too. All of that sums up the terraforming as impossible today.

But what would happen if we already warmed up Mars (eg. with CO2)? It's atmosphere would consist of around 99% CO2 then and would lack oxygen and nitrogen. We could start production of oxygen using eg. ecopoiesis, but as it would lower the amount of CO2 wouldn't it also cool the atmosphere down again?

So let's put money and time aside: What would hypothetical chronological roadmap of what should be done in order to terraform Mars look like?

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The most important problem is that today we can't even terraform the Sahara desert. Thus, having an objective project plan is the far future yet.

Not only $\rm CO_2$ has greenhouse effect. According this answer, the average temperature of an Earth without any athmosphere would be around $\approx \rm 0^\circ \rm C$. The current average temperature is $\approx \rm 15^\circ \rm C$. Most of the difference isn't caused by $\rm CO_2$, but by water vapor and air.

The soil toxicity - large mass of perchlorate salts - seems probably solvable, probably with at least a little genetic engineering. There are highly sodium perchlorate tolerant bacteria. But there is no known organism which could survive and grow in the lack of water.

Although a lot of water was found on the Mars, this "a lot" is only compared to what we knew before the probes. The total known water mass of the Mars makes the whole planet still so dry, like a desert.

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