David Attenborough said this quote

I don’t know [why we're here]. People sometimes say to me, ‘Why don’t you admit that the humming bird, the butterfly, the Bird of Paradise are proof of the wonderful things produced by Creation?’ And I always say, well, when you say that, you’ve also got to think of a little boy sitting on a river bank, like here, in West Africa, that’s got a little worm, a living organism, in his eye and boring through the eyeball and is slowly turning him blind. The Creator God that you believe in, presumably, also made that little worm. Now I personally find that difficult to accommodate…

~ David Attenborough

‎Using his burgeoning intelligence, this most successful of all mammals has exploited the environment to produce food for an ever increasing population. Instead of controlling the environment for the benefit of the population, perhaps it's time we controlled the population to allow the survival of the environment.

~ David Attenborough

Now, over half of us live in an urban environment. My home, too, is here in the city of London. Looking down on this great metropolis, the ingenuity with which we continue to reshape the surface of our planet is very striking. It’s also very sobering, and reminds me of just how easy it is for us to lose our connection with the natural world.Yet it’s on this connection that the future of both humanity and the natural world will depend. And surely, it is our responsibility to do everything within our power to create a planet that provides a home not just for us, but for all life on Earth.

~ David Attenborough

I find it far more awesome, wonderful, that creation; our appearance in the world; should be the culmination, or at least one of the latest products of 3,000 Million years of organic evolution, than a kind of country trick, taking a rib out of a man's side in a trance.

~ David Attenborough