This is also why most of the world policy makers don't understand why overpopulation is so huge problem as it too is an exponential process. If we take Africa

This is also why most of the world policy makers don't understand why overpopulation is so huge problem as it too is an exponential process. If we take Africa as an example then in 1950s there were around 200 million people in Africa. In year 2000 there were around 800 million people. Today there are 1.5 billion people in Africa and UN projects that for the end of century there will be 4 billion people in Africa with a big if - if the fertility rates go below replacement levels due to development in education and personal well being. What if the world policy makers really understood exponential growth? There would be no question if we could provide prosperity for everyone on Earth.