Hi Justin: We are starring the sixth extinction process and we cannot sit and just wait to see if some day population starts declining. We need to act now. Yes, the contribution of China and some other countries has been great in this matter, but we need to focus on mother nature. She only sees that in 1981 we were growing at 80 million people a year and today, more than three decades later, we are growing at 81 million people a year. But natural resources do not grow. Today the sixth extinction is already coming and there is nothing we can do to reverse that, but we can change how devastating it will be if we acknowledge that population growth exacerbates climate change, pollution, the extinction of species and loss of ecosystems. This is not my idea. This is the global scientific consensus statement which is clearly exposed here (It has been delivered to president Xi): http://consensusforaction.stanford.edu/see-scientific-consensus/consensus_english.pdf