(not a reply to seanmcdirmid) I couldn't reply directly to 'ayewo's post, so I reply here: I'm not sure where you are finding birthrates are climbing elsewhere. The forecast for most of the planet is birth decline over the next 50 and 100 years. Africa will mainly still contribute to population growth, but a lot of other areas/countries are headed for net decline in population, with the results hitting us in 50 and 100 years. It is not necessarily all bad, if we cope with it in relevant ways - a "solution" that was based on populations steadily forever climbing wouldn't be sustainable anyway, for many reasons.