Is there a limit to how much I can cool down a planet through anti-greenhouse gas beyond my species' maximum atmospheric pressure tolerance? That's 4 atm, in the case of humans. I know there's a maximum greenhouse factor that prevents me from heating up planets past a certain point (Titan, argh), but I don't know if there's a similar anti-GH measure.
Also, how can I calculate if I'll be able to bring the temperature level down enough with 3.9 (maximum minus minimum oxygen pressure) atm of anti-greenhouse gas, at most?