Population shrinkage will be a rounding error in the face of climate. We already had the AQ9 oil company document from 1980 on the front page today. That predicts the end of all economic growth by 2025. Sure they might be a out by a decade or so, but not a bad guess for 40 years ago! Growth has been trending down for decades. Think about that. Recession becomes the normal state of things. A downturn tips into a major depression if you start at recession.
There's another page for men... https://www.nhs.uk/conditions/contraception/female-sterilisa...