Agreed.
My 'parameters' are simple, and all are from published, experimentally repeatable actual physical measurements of Carbon Dioxide in air.
1. Below approx. 250 ppm plants starve, regardless of sunlight and water.
2. At current levels of approx. 400 ppm, an increase in plant growth has been observed in just the last couple of decades.
3. Commercial greenhouses routinely flood their atmospheres with 1500 ppm to promote growth.
4. Submarine crews routinely live with concentrations of 3,000 to 9,000 ppm with no ill effects.
5. Without CO2, plants CANNOT release Oxygen for other life forms to breathe.
The alarmist hysteria is (yet another) scam for control.