One in eight plant species face extinction.

How could I look my grandchildren in the eye and say I knew what was happening to the world and did nothing.

The process of making natural history films is to try to prevent the animal knowing you are there, so you get glimpses of a non-human world, and that is a transporting thing.

It's coming home to roost over the next 50 years or so. It's not just climate change; it's sheer space, places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us, and the natural world is doing it for us right now.

The World is full of wonders, but they become more Wonderful, not less Wonderful when Science looks at them.

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.

I think we're lucky to be living when we are, because things are going to get worse.