\"The future of life on earth depends on our ability to take action. Many individuals are doing what they can, but real success can only come if there's a change in our societies and our economics and in our politics. I've been lucky in my lifetime to see some of the greatest spectacles that the natural world has to offer. Surely we have a responsibility to leave for future generations a planet that is healthy, inhabitable by all species.\"
\"Population growth is the single biggest threat to life on earth. No doubt at all. A great number of our major environmental problems [...] are caused by more and more human beings wanting the fresh air of the earth. I'm not one who says that you should let babies die or that you should deny the man in the Brazilian forest the right to grow food for his children, but if we do want a solution to the problem, the correct solution is population control.\"
- Sir David Attenborough