My high school biology is fuzzy, but I recall a lecture on how green plants breathe in carbon dioxide and emit oxygen. If we limit carbon dioxide, doesn't that adversely affect green plants?
Well, if we all stop breathing in the oxygen and exhaling all that carbon dioxide (not to mention the bovine flatulation problem) maybe that would help. Anything for the caws, I always say....
Plants thrive in a CO2-rich environment. Marijuana growers have known this for years. I remember reading something about pumping CO2 into their grow rooms to create bigger, fuller, healthier plants.