The notion of ever more old people needing ever more young people, who will in turn grow old and need even more young people, and so on ad infinitum, is an obvious ecological Ponzi scheme.
David AttenboroughIn the West, that's what's happening. The birth rate has been dropping steadily and still is. But there is still a vast amount of the world where that's not the case. And that is where the big population growth is taking place.
David AttenboroughIt is that range of biodiversity that we must care for - the whole thing - rather than just one or two stars.
David Attenborough