I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial.

Cameramen are among the most extraordinarily able and competent people I know. They have to have an insight into natural history that gives them a sixth sense of what the creature is going to do, so they can be ready to follow.

I had a huge advantage when I started 50 years ago - my job was secure. I didn't have to promote myself. These days there's far more pressure to make a mark, so the temptation is to make adventure television or personality shows. I hope the more didactic approach won't be lost.

I'm absolutely strict about it. When I land, I put my watch right, and I don't care what I feel like, I will go to bed at half past eleven. If that means going to bed early or late, that's what I live by. As soon as you get there, live by that time.

The 'environmental left' tells us that, though we have natural resources like natural gas and oil and coal, and though we can feed the world, we should keep those things in the ground, put up fences, and be about prohibition.

There are environmental threats to health; there are internal threats to health - genetic conditions, viral threats, diseases like cancer and Parkinson's. And then there are societal and global ones, like poverty and lack of nutrition. And unknown viral threats - everything from a new kind of influenza to hemorrhagic fever.

We can't leave everything to the free market. In fact, climate change is, I would argue, the greatest single free-market failure. This is what happens when you don't regulate corporations and you allow them to treat the atmosphere as an open sewer.

We should bring in an environmental attitude, and I think luxury should automatically be about sustainability and quality.