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.

Looking at the world through a sustainability lens not only helps us 'future proof' our supply chain, it also fuels innovation and drives brand growth.

Justin Trudeau certainly understands climate science, as do his ministers. But they're refusing to take action on it because of short-term political concerns.

We, as a country, have always used innovative technology to advance environmental stewardship, reduction of those pollutants, but also grown our economy at the same time.

If we brought the mammoth back to Siberia, maybe that would be good for the ecosystems that are changing because of climate change.