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Do humans and much of their livestock exhale CO2?
Has the population of humans and their livestock increased since the industrial age?
Does that not necessitate an increased transitory presence of CO2 in our atmosphere?
Would it not be unsafe to attempt to artifically reduce CO2 levels before knowing what levels need to be present for our biological needs?
The amount of CO2 exhaled by hums/livestock is minute in comparison to the production of CO2 by industry, cars etc In any case this CO2 is part of the carbon cycle of plants and has no effect/relation to the increase caused by human industrial/agricultural activity
https://www.skepticalscience.com/breathing-co2-carbon-dioxide.htm
https://www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm
Humans and animals need minimal amounts of CO2. It is an essential part our biology but in fact we run more risk of falling ill with excessive CO2 in the atmosphere.