From Unofficial Stationeers Wiki
Carbon dioxide (CO2) is a non-flammable gas found in some atmospheres naturally (such as Mars). It can also be produced by burning Fuel or Coal, smelting most ores (e.g. Iron, Copper, and Silicon) and through human respiration. It is required in any amount for plants to grow; higher amounts of CO2 will cause them to generate Oxygen.
Carbon dioxide has a specific heat of 28.2 Joule / mol, making it a superior Coolant to Pollutant. Both are greatly surpassed by Water, but this is usually uncommon and has more important uses than as a coolant.
You can collect Carbon Dioxide from the following sources:
|Coal Ore||10 mol|
|Copper Ore||1 mol|
|Gold Ore||0.2 mol|
|Iron Ore||0.5 mol|
|Lead Ore||0.4 mol|
|Nickel Ore||1 mol|
|Silicon Ore||1 mol|