It is ingrained in North American capitalistic mentality that constant economic and population growth is good. We need to reverse this mentality.
Many of the poorest countries tend to have the fastest growth in population, when they can least afford it on both a macro and micro level. Many couples who can barely feed themselves will have several children, creating more hungry mouths and suffering. Many of these people would practise birth control if they could afford it or if their religion allowed it. We cannot change their religion but we can provide birth control.