I think only a very small number of people are encouraging unsustainable growth and I doubt many people are having kids because of it. The earths population is

I think only a very small number of people are encouraging unsustainable growth and I doubt many people are having kids because of it. The earths population is growing because people, particularly people in the 3rd world have a good amount of kids. Respectfully, I think you are over complicating the situation. People in many parts of the world, simply enjoy sex and having kids. Not due to lack of birth control, simply due to the desire to have children. Its that simple. Its only when you make it to the first world with our stresses and self induced neurosis does the fertility rate fall. Humans are part of nature and one of our instincts is to reproduce.