Almost nobody really understands how little CO2 is in the atmosphere: 400 parts per million - in more understandable terms, four parts per ten thousand. So, if you walked 10,000 steps - about 5-1/2 miles, CO2 would represent your first four steps - about five seconds out of a two-hour walk, and that ignores the fact that 97% of that CO2 is produced naturally, outside man’s control.
Volcanoes, swamps, rice paddies, fallen leaves, even insects and bacteria produce CO2 as well as methane, another greenhouse gas. Termites alone emit far more CO2 than all the factories and automobiles in the world. Natural wetlands emit more greenhouse gases than all human activities combined. If we could eliminate not only all human use of fossil fuels but all natural sources of greenhouse gases as well, 96% of any greenhouse effect would still remain, because of water vapor.
We are now at a near-historical LOW in CO2 levels - about 400 ppm, well documented by ice cores and other measurable sources. At 150 ppm, plant die-off begins - plants, which, by the way, make ALL of the oxygen that keeps animals like, say, humans alive.
It is likely that the recent uptick in CO2 levels are, indeed, manmade. The upside to that is a surge in greening throughout the planet - farms are more productive, producing more food, and by the way, this greening absorbs more carbon dioxide - the “problem” solves itself through the process of buffering.
Don’t let anyone tell you that the “climate crisis” is real or that it has anything to do with a Very Beneficial and Rare Gas, carbon dioxide. It has nothing to do with any of that, and everything to do with power. Never forget that.