So in my story, a group of people must colonize a planet that is habitable with a lot of sources of water and oxygen, and they need the right temperature, but I wasn't able to calculate the Greenhouse effect of 9% carbon, so my first question is how hot the planet will be? and if I place it a bit farther (Like 0.55-6 or so) how much it will cool down?
Even if the planet became colder than the average temperature of Earth but can support liquid it will be fine for me.
And if farther is not enough, how to reduce the carbon? or is there a way to make an anti-greenhouse effect?
Can the carbon cycle reduce the CO2 to reach an Earth-like amount?
My planet is orbiting a K type Star/Orange dwarf and doesn't have life on it.
Planet:(Unit is Earth = 1) Mass: 1.8 | Radius: 1.2 | Atmosphere: 88% N2 / 9% CO2 / 1.5% Argon / 1.5 other gasses. with Presure at sea level of 1 atm.
Semi-major axis(Changeable): 0.5 AU (Note that ~0.52 AU is the distance where the heat and energy received from the star is the same as Earth does from the sun), I don't know if it would be tidally-locked to the star, so just in case I made it have a very big moon with 0.2 Mass and 0.6251 Radius, so it can break the lock and make it locked to the moon instead, with a semi-major axis of 84500 km from the main planet center, which caused a day of almost a 48 hour(I'm fine with that). And I'm fine with binary-planets too.
With ~25% land and ~75% Sea of H2CO3(Carbon Cycle caused Low CO2 on the atmosphere + Sea being H2CO3) Of course, it does have a magnetic-field and plates tectonic.
Star: (Unit is Sol/Sun = 1) Mass: 0.72 | Radius: 0.78 | Luminosity: 0.2687 | Surface Temperature: 4710 Kelvin
And I don't know if my planet is plausible at all, so sorry you can ignore it and edit some properties if u want.
And sorry for taking your time, also for the bad title.
I forgot to mention that the atmosphere must be survivable, I want the atmosphere to be safe for the body so you will only need an oxygen mask to be able to live there. (Edited)