We are at those levels for almost 50 years now in "the west". Guess you are conveniently disregarding the mess you created over this last half century(and long before when the growth in India was 6 children per couple while in the USA it was 3).
Here is a novel idea for you: you use the resources available by your territory as you see fit as long as you don't destroy the rest of the planet for us. If you choose to do it with double your population or half your population, is solely your sovereign choice and we have nothing to say about it. The same way you shouldn't have anything to say about how we use our resources with our - in check - population where people - for a very long time now - mostly think twice about if they can actually support a child with the resources available (natural or economic) before having it.