Demography has always been a hobby of mine. I am more concerned with the birth rate crisis in the First World than rapid growth in the 3rd. Bangladesh was a problem but its dramatically decreased its birth rate over 15 years, today its only a little higher than the US was at the height of the Baby Boom years (CIA Factbook). I look more at the numbers and trends rather than stuff like food availability, so I might be missing the other side of the equation.
India has the same Birth Rate as Utah, while Brazil and Thailand are below it. There are almost no countries left with birth rates over 45 per thousand. Iran is another place that has seen births over the past 20 years drop by over 50%. Except for Nigeria, Yemen and a few African countries, there is no longer a population explosion problem. China may have a billion people but that doesn't mean anything
Population growth over 1% a year is a sign of a healthy, dynamic society. I think the West should try to increase its native birth rate rather than relying on immigration, although I'm not one of those Zero P. Growth racists. Financial inducements in Europe and Australia don't seem to work so we need another plan. Japan, Russia, Germany and Italy are high on the list of demographic trouble spots.
Spain too IIRC.