[jonrick46]

The Left will go berserk that corporations will increase the CO2 on Mars, causing global warming. Terraforming will be given a bad name.

[a fool in paradise]

Mars is farther from the Sun. We could use a warmer Mars if we were to try and inhabit it.

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Differing in situ values have been reported for the average temperature on Mars, with a common value being −63 °C (210 K; −81 °F). Surface temperatures may reach a high of about 20 °C (293 K; 68 °F) at noon, at the equator, and a low of about −153 °C (120 K; −243 °F) at the poles. Climate of Mars - Wikipedia https://en.wikipedia.org/wiki/Climate_of_Mars

[HartleyMBaldwin]

Yes, the atmosphere of Mars is only about 95% CO2 now. Any human activity could destroy the planet via runaway greenhouse warming.

/sarc, if necessary