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So, for people who don't get the joke, a quick overview.
Atmospheric CO2 has increased from ~280 parts per million to ~430 ppm now. This causes problems besides global warming; notably ocean acidification. Scientists try to infer CO2 levels in the past from various indirect evidence. It seems that levels have not been this high in many millions of years, much longer than the existence of our or most other species.
That said, direct effects from these elevated CO2 levels are extremely implausible. We exhale CO2, meaning that indoor concentrations are typically much higher than these elevated atmospheric levels. On top of that, you have a lot of combustion, especially in cities. Cities have elevated CO2 concentrations compared to the surrounding area (think about smog). The northern hemisphere has higher concentrations than the southern one. The CO2 concentrations most of us live with have more to do with our immediate surroundings than global levels. Fun fact: Roadside grass can have a radiocarbon date of thousands of years.
The most iconic CO2 measurements (Keeling Curve) are taken on Hawaii, on a mountain in the middle of nowhere. I have heard that Elon and the felon are shutting that down now.
High CO2 levels can become a problem in badly ventilated places. CO2 is slightly heavier than air, so it can build up in wine cellars or cesspits. Fermentation creates the CO2. Typically, that kills more than 1 person. Person #1 goes down, passes out. Person #2 goes down to check on them.