[Shrezzing]

>So 0.0012% of CO2 in atmosphere caused by humans. Nature is responsible for the remaining 0.0388% in atmosphere.

Unless you're discussing literal "human expelled co2", as in "the measure of peoples exhalations during breathing", then you're out by several orders of magnitude. The pre-industrial co2 concentration in the atmosphere trends between 180ppm - 300ppm. In the last hundred years, the concentration has increased to 420ppm.

https://climate.nasa.gov/vital-signs/carbon-dioxide/

For reference, each 1ppm in the atmosphere is around 7.8 gigatonnes of CO2. Humans currently create around 40gigatonnes of CO2 per year, roughly equating to 5ppm added per year. We add equivalent to 0.8% of the atmospheric CO2 per year.