Carbon Dioxide is a byproduct of human and plant respiration, and a primary component of Martian atmosphere.
In Occupy Mars: The Game, you can obtain Carbon Dioxide from CO2 Scrubber, store it in Carbon Dioxide Bottles, and use as a working fluid in Air Compressor.
| “ | CO2, carbon dioxide, is an inorganic chemical that constitutes 96% of Mars' atmosphere. It's a colorless, non-flammable gas weighting 150% mass of the Earth's air. Generally, CO2 isn't a harmful compound, as it is even a co-product of respiration and a part of photosynthesis. Yet, in large concentration it is a toxic and unbreathable chemical. Interestingly enough, Mars' temperatures, especially on the poles during winter-time, exceed CO2's freezing point. This phenomena creates beautiful dry-ice caps, which are often mistakenly perceived a snow. According to the scientists from Earth, carbon dioxide is a crucial factor in pressurizing the Red Planet's atmosphere, as a part of making Mars a human-habitable planet. Although research carried out by B. Jakosky and S. Edwards in 2019 suggests the amount of CO2 on Mars is definitely too little to make the Planet "human-friendly", Mars' carbon dioxide can still be used to create a higher pressure inside habs. | „ |
| ~ Marsopedia on Carbon Dioxide |