Wouldn’t all plants on earth die without CO2?
And what produces the oxygen that we breath?
His logic is flawed - making people healthier with vaccination and better health care is going to increase populations because life spans will increase meaning their are more people for a longer amount of time.
His flawed logic doesn’t end there. He’s (we could argue whether it’s unwittingly, or not) going to force standards on other cultures he’s seeking to “improve” and “protect.” This is only accomplished by changing them. They’ll either integrate or become a millstone around the necks of other “civilized” and “enlightened” cultures, since they would require more resources than they produce. At that point, they’d run the risk of being viewed as “human weeds,” just as previous progressives did.