It's taken us a short time to change the nature of nature. In my lifetime, more change than during all preceding human history put together.

If somebody dumps something noxious in my back yard, the dumper is the last one I would call on to repair the damage.

Since the middle of the 20th century, more has been learnt about the ocean than during all preceding human history; at the same time, more has been lost.

It's mainly the high-end luxury market now that drives much of the fishing in the sea. It's not feeding the starving millions. It's feeding a luxury market.

We've got to alter our fossil fuel dependence and go to other energy sources.

Throughout all of human history we have consumed the natural world. All creatures do. Birds do. Fish do. Earthworms do. We consume the natural world as a source of our survival. But no creature has ever consumed at the scale that humans have, and now there are seven billion of us. I think the good news is that a large percentage of those seven billion minds can work to make better decisions.

In terms of personal choices, let's all think more carefully about where we get our protein from.