You can subtract death rate from birth rate, and the world looks screwed. For China, this is (13.1 - 7.1) per 1000. For India, it's (21.76 - 6.23) per 1000. So for the world's middle class, that's about 2% population growth per year. Yikes.
But the you realize, that China and India have very few really old people. Now that they have decent medical treatment, the older Chinese and Indians live longer, pushing the population up. But they aren't having any babies, so in the long term we might not be growing like lemmings.
For China, it's 1.54, and it's 2.6 for India. Anything under 2 (plus a bit for the ones who don't reach fertility) means a declining population, in the long term.
But the you realize, that China and India have very few really old people. Now that they have decent medical treatment, the older Chinese and Indians live longer, pushing the population up. But they aren't having any babies, so in the long term we might not be growing like lemmings.
So you look at the fertility rate:
http://en.wikipedia.org/wiki/List_of_countries_and_territori...
For China, it's 1.54, and it's 2.6 for India. Anything under 2 (plus a bit for the ones who don't reach fertility) means a declining population, in the long term.