Lol sorry i thought you were referring to your Einstein quotation
Do you honestly think all around the world at this point in time the co2 levels will be the same everywhere .
Horticulturists work constantly to improve crop yield, they know exact co2 levels at any point in time and tailor nutrients to suit which fluctuate seasonally and for various other reasons. Indoors its a totally controlled co2 environment to the ppm .
