I have recently heard the world population is 7 billion. Perhaps it is even more now. I am wondering if you feel the world is in danger of not having enough resources to handle the population. I once read something someone wrote on the Internet that said that world population is caused by people living longer, and they didn't talk about people who have endless children. What is your opinion on this? How important is sustainability in regards to this? I feel frustrated about people having endless children.