Yes, you are right Nathan, carbon dioxide is toxic over 5% concentration. But not in the game, and I don't really like much the "safe gas" options.
I don't know, I was just stating that a generic "safe gas" is kind of... immersion breaking....
As far as I know, water vapor is the only non toxic greenhouse gas but.... to go as far as to create a water vapor atmosphere... I don't know, but could it be considered?
Well, sulphuric acid, hydrogen sulphide and sulphur dioxide are all anti-greenhouse but I didn't think anyone would go for those so I added the anti-greenhouse gas Although, if anyone can suggest a better alternative I would be happy to add it.
Bear in mind though that a new player would have to know which was the anti-greenhouse gas in order to select it - that was one of the reasons for having an obvious name.
As for anti greenhouse gases, I did read that helium has that kind of behaviour, but it's so rare.... perhaps, how about something different, like first you make a normal, inert atmosphere. I don't know, nitrogen. Then you pump particulate in the atmosphere, creating a permanent "cloud effect" that does not allow radiation to reach the surface. It could work theorically, right?
And it could be explained in the wiki
And yes, I'm being a nitpick, I know