David Attenborough’s latest TV series, Frozen Planet, is being heralded as his take on climate change. Now 85, he explains why – finally – he’s speaking out on the issue, and shares the joys of a long life spent filming sex and death in the wild ‘I’m not a propagandist, I’m not a polemicist; my primary interest is just looking at and trying to understand how animals work,” says David Attenborough. We are talking in a gigantic BBC sitting room. Attenborough, wearing slacks, shirt and jacket, is a trifle unkempt at 85,