Anyway, I didn't say anything about a lower birth rate in third world countries, but a lower population. These are not the same thing. Logically, if that one child isn't dying from disease, the birth rate may drop by 1 per family, but the population would stay the same, or even grow because more females might reach the age of fertility because they're not dying. Considering most of these countries have high muslim populations, they're not going to be overly keen on certain contraceptions (if at all) so I believe education will make very little difference to their population. The only way I could see a massive drop in population would be from war, famine, natural disaster or fertility issues.