Tackling overpopulation (cont’d.)

It’s pretty obvious that we must first stop the population growth on this planet, and if possible reduce it drastically over time if humanity it is to survive with a certain modicum of comfort. Some have suggested that there’s an urgent need to start implementing a China-like one-child policy globally as this would help control and reduce population gradually and successfully, as evidenced by China’s success in reducing poverty in recent years. Others propose that governments around the world stop spending on child-vaccination because our off-springs should survive naturally by principle of "survival of the fittest", as humans have survived before the introduction of modern vaccination. These folks also suggest that the funds saved from immunization should instead be better spent on education. Finally, some conspiracy-theorists think that countries might one day develop a contagious, but non-lethal infertility-virus that spreads infertility amongst humans, thereby reducing future human-population. What’s your take on these ideas?