At our current population 40% of insects could be extinct in the coming decades, and over the last 50 years 60% of animal populations have been wiped out: https://www.cnn.com/2019/02/22/health/food-biodiversity-repo...
edit: To clarify, people say that we have exceeded the carrying capacity of the Earth or that we'll exceed it as the population mushrooms. This data proves the population won't mushroom, and I assert that 11 billion is well within the carrying capacity of the Earth. Do I have any proof? No. But neither do the doomsayers who claim otherwise. That's the specific narrative I'm trying to push back against.
What you meant to say is that we can't survive below some threshold of biodiversity. Nobody's talking about zero biodiversity. What do you think that threshold is? I think we can survive (and the environment will be okay with) less biodiversity. How much less that turns out to be I guess we're going to find out.