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by gnulinux 2872 days ago
CO2 is a pollutant just like O2 is a pollutant. The earth has a certain balance and the physical phenomena as well as the biosphere collectively support and rely on this balance. If you add too much O2 you'll get a mass extinction. This was the causes of one the earliest mass extinctions on the earth. [1] CO2 is an essential gas for life to be sustained, arguably as important as O2, but that doesn't mean you can arbitrarily add CO2 to the system and expect similar outcome. At some point you'll break the system. This is true for other "good" gases too such as O2, N2, H2 etc...

[1] https://en.wikipedia.org/wiki/Great_Oxygenation_Event