The problem is our use of resources. And there is too many of us. But there's too many of us, just for an example because there's many other things, in regards to the resources we use that put pollutants in the air. Over in India when the covid lockdowns started, wasn't there a story about how they could see the Himalayas for the first time in years, because not as many people were out driving putting out smog and shyt. But moving away from fossil fuels as an energy source isn't good for profits. It's probably why France and 10 other EU nations want nuclear energy to be listed as a green energy source.
high density easy to exploit fossil fuels are running out and would have run out already if we had a much bigger population.
there aren't enough resources on this planet for a "modern" high standard lifestyle for everyone. i.e. a life with meat/fish meals, access to power, car ownership, access to medicines etc.
as things stand e.g.
"In the United States, more than 7 billion chickens are killed for their flesh each year, and 452 million hens are used for their eggs. read more. 1.
51.4 billion chickens are artificially hatched, fattened up and slaughtered as 42-day-old babies every year globally. A chicken's normal lifespan is 10-15 years."