That really has nothing to do with it. In fact, the problem is the low death rate, without a corresponding low birth rate. The former tends to fall before the l

That really has nothing to do with it. In fact, the problem is the low death rate, without a corresponding low birth rate. The former tends to fall before the latter, causing a population explosion that then levels off; during the period before population stabilizes, you have a disproportionate number of young people. [https://en.wikipedia.org/wiki/Demographic_transition https://en.wikipedia.org/wiki/Demographic_transition] Interestingly, there's also a certain delay - even after fertility rates (children each woman will have over her lifetime by current trends) fall, birthrates (births each year per capita) take a while to fall, and even after birthrates fall population growth takes a while after that to fall as larger cohorts of young people replace smaller dying cohorts of old people. [https://en.wikipedia.org/wiki/Demographic_momentum https://en.wikipedia.org/wiki/Demographic_momentum]. What all this means is that on the one hand, population increase can be very hard to stop on a short-term basis, but also that current fast growth rates shouldn't be extrapolated too far into the future.