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Yeah that really needs to be emphasized. Mammals were created during a period when CO2 was much higher. Same with primates. Even primitive homo species first evolved in a period when CO2 was doubled or greater. Im not in favor of changing the nature of the atmosphere but CO2 levels go up and down all the time, geologically speaking. They are driven by geothermal activity. Theyve created a massive entitlement with a vested interest in finding “the problem” they are funded to study. Its a deeply biased field. They are constantly caught cherrypicking data and manipulating models to justify their existence. Its just shitty science like the covid era. Smart people perform bad science for self-interest.

...with current 400s outside. If it's 800 outside, it will be above 1200 ppm indoors. I suppose we'd develop better better air conditioning to mix more fresh air from outside.