[tottefan]

The developed countries are the ones with the population crisis. The developing countries still have very high birth rates so their populations are still rising at a rapid rate.

The crisis will mainly affect Western Europe/parts of central Europe/Russia/Canada/Australia/New Zealand etc. Some countries already have a declining population, despite immigration.

The numbers are not the problem. The world has more than enough people. It's to do with the number of people of working age who can support their national economy. Too many old people who can't contribute but need financial assistance will be the problem in future.