Gee, it almost sounds like CO2 is a trace element and really much of anything, considering trace elements are just along for the ride y definition.
I wish I could find a horticultural/plant physiology video I watched last winter. Sometimes real science just kinda slips out. The video discussed basic photosynthesis needs for growing plants indoors. Obviously, CO2 is an input to photosynthesis. For some reason the lecturing professor wanted to emphasize how little CO2 is in the atmosphere. He demonstrates this by small balls representing elements/molecules in large, same sized glass containers. Nitrogen huge. Oxygen huge. CO2 itty bitty. (Yes, that is unit of measure lol) While I already knew the percentage of CO2 in the atmosphere, that visualization was good enough for me to remember. Every school kid should see that, WITHOUT any climate change, end of the planet BS.