All the modern devices we have enable us to investigate things and have enabled us to do better.

Dealing with global warming doesn't mean we have all got to suddenly stop breathing. Dealing with global warming means that we have to stop waste, and if you travel for no reason whatsoever, that is a waste.

Many individuals are doing what they can. But real success can only come if there is a change in our societies and in our economics and in our politics.

I mean, it is an extraordinary thing that a large proportion of your country and my country, of the citizens, never see a wild creature from dawn 'til dusk, unless it's a pigeon, which isn't really wild, which might come and settle near them.

All the modern devices we have enable us to investigate things and have enabled us to do better.

Do we really require so many gardening programmes, makeover programmes or celebrity chefs?

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.