David Attenborough

This is now a moral issue on a par with slavery.

The world's growing hunger for meat and for milk is going to take a terrible toll on the world's resources of water and cropland.

I don't know [if God exists]. But I do know that there's a profound mystery in the fact that we exist at all.

Half of the world's population has never seen an elephant.

We are at a unique stage in our history. Never before have we had such an awareness of what we are doing to the planet.

The only way to save the planet is to stop using fossil fuels.

I have seen some of the most beautiful things in the world, and I have seen some of the ugliest.

The natural world is the greatest source of visual beauty.

We must all do something to help save the planet.

It's extraordinary how inventive one can be with ethanol alone.

The human population is now so large that it is having a profound effect on the planet.

I think there is a moral imperative for us to act now.

Life is a great adventure.

The more we learn about the natural world, the more we realize how little we know.

We have the power to change the future.

Biodiversity is the key to life on Earth.

I am optimistic because I believe in human ingenuity.

The loss of biodiversity is a tragedy for humanity.

Nature is not a place to visit. It is home.

We must protect the wild places for our children's children.