World population is growing 1% a year. If you go back a century, world population never grew that fast in human history (except perhaps the dawn of human history). There is no global population collapse happening or on the horizon, this past century has had the fastest human growth rate in history, including now (the peak was the world baby boom in the 1960s).

There are countries where population is falling, and policy has to account for it, but there is not a global population collapse right now at all. Only if you measure against the peak baby boom of the 1960s does it seem less.