As early Greenpeacer turned sensible environmentalist Dr. Patrick Moore suggests we should be celebrating CO2 and increasing levels will be a boon for the biosphere.
"CO2 is the currency of life and the most important building block for all life on Earth. All life is carbon-based, including our own. Surely the carbon cycle and its central role in the creation of life should be taught to our children rather than the demonization of CO2, that “carbon” is a “pollutant” that threatens the continuation of life. We know for a fact that CO2 is essential for life and that it must be at a certain level in the atmosphere for the survival of plants, which are the primary food for all the other species alive today. Should we not encourage our citizens, students, teachers, politicians, scientists, and other leaders to celebrate CO2 as the giver of life that it is?"
https://www.thegwpf.org/patrick-moore-s ... n-dioxide/
You can buy CO2 grow room kits and show yourself higher CO2 levels are good for plants.
"While normal outdoor CO2 levels (about 400ppm) will achieve normal plant growth, doubling or tripling the CO2 levels can increase the growth rate. However, above 2,000ppm CO2 becomes toxic to plants, and above 5,000ppm CO2 becomes potentially harmful to people. Most experts agree that 1,500 ppm is the maximum CO2 level for maximum plant growth, although any CO2 level between 1,000ppm and 1,500ppm will produce greatly improved results."
https://www.co2meter.com/blogs/news/410 ... greenhouse