> (...) the global average total fertility rate will have dropped below replacement. My pet theory is that when the system becomes untenable, procreation slows

> (...) the global average total fertility rate will have dropped below replacement. My pet theory is that when the system becomes untenable, procreation slows down, which will in time trigger a kind of reset - not that it's going to be fun to live through or anything. Self-regulation.