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.

We really need to kick the carbon habit and stop making our energy from burning things. Climate change is also really important. You can wreck one rainforest then move, drain one area of resources and move onto another, but climate change is global.

I don't approve of sunbathing, and it's bad for you.

I suffer much less than many of my colleagues. I am perfectly able to go to Australia and film within three hours of arrival.

There are perfectly good independent small nations.

To suggest that God specifically created a worm to torture small African children is blasphemy as far as I can see. The Archbishop of Canterbury doesn't believe that.

I believe the Abominable Snowman may be real. I think there may be something in that.