“ The world would easily heal if each person brought a maximum of just one child into it, by 2075 the human presence would on earth would have been reduced by half. At such far more manageable numbers we would have the benefits of all our progress plus the wisdom to keep our presence under control. That wisdom would come partly from the losses and extinctions too late to reverse but also from the growing joy of watching the world daily become more wonderful. The evidence would not hide in statistics. It would be outside every human’s window, where refreshed air would fill each season with more birdsong”.
Alan Weisman. The World Without Us. 2007.