[W]hen we look at the graphs of rising ocean temperatures, rising carbon dioxide in the atmosphere and so on, we know that they are climbing far more steeply than can be accounted for by the natural oscillation of the weather ... What people (must) do is to change their behavior and their attitudes ... If we do care about our grandchildren then we have to do something, and we have to demand that our governments do something.

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

You can only get really unpopular decisions through if the electorate is convinced of the value of the environment. That's what natural history programmes should be for.

Instead of controlling the environment for the benefit of the population, perhaps we should control the population to ensure the survival of our environment

I suspect that happiness is not a state but rather a transition.

Getting to places like Bangkok or Singapore was a hell of a sweat. But when you got there it was the back of beyond. It was just a series of small tin sheds.

Fundamentally not to waste energy. If we were all to reduce our demands for energy, it would make an enormous amount of difference.