“We have it in our hands to save the world, and we have made a tragic, desperate mess of it so far.
“Nations are coming together and recognising we all live on the same planet and we are dependent on it for every mouthful of food we eat and every breath of air we take.
“And making programmes like this, I’ve been doing it for a long time, and I’m sure a hell of a lot of young people are saying, ‘For God’s sake, why doesn’t he move over? Give another person a chance’, but, anyway, there I am.”
Sir David also claimed he still gets the same buzz from making documentaries and hopes it will inspire others.
He explained: “It is extraordinary.