One of the things I find so amazing about how Earth's lifeforms evolved is that plants take in CO2 and release O2 as by-product. Whereas animals need O2 and CO2 is what they exhale.
There are many other cycles to a healthy biosphere, but this really basic one in respiration is frankly deserving of the original meaning of "awesome".
Messing these beautiful systems up for a few uppity primates to accrue power, status & $ is dysorderly.