Destruction of the earth has increased and even accelerated too. Forests, corals, and vertebrate populations have been decimated.
Many consume very little and a few consume far too much. You can't say the average/sum is the problem when a minority is ruining everything.
It's obvious that a 10x smaller human population would have a 10x smaller environmental impact (assuming the same behaviors and lifestyle)
However, what is killing us is overproduction, overconsumption and a whole economic model devoid of sustainability goals.
"Overpopulation" is used by some people as a diversion tactic.
As far as I know, people in dense cities also pollute far less than other (less heating per capital, smaller households, less commute, more walking/biking...).