How to create more CO2?

[Wolfer Lycan]

I found that the plants created by biodome need CO2 to keep growing.
And when the CO2 are all depeleted, the plants all stop growing.
I tried to use CO2 generater and burn out all the carbon mines but that is still not enough for the plants.
Is there any other mechanism to create CO2?

[cswiger]

Sure, but it is not recommended. Plant growth is supposed to slow way down once the CO2 level falls. If you simply process all of the CO2 to O2 without adding much more, you'll actually be close to having a good balance once you import enough N2.

One of the import asteroid missions ought to raise CO2. Or you can let the O2 level go too high and start world-wide superfires. That'll produce some CO2, but will have other side effects....