There are countless wildlife programmes harkening back to the mists of time, but there’s only one David Attenborough. He’s the gold standard of natural history and been doing it a very long time. There he is onscreen, popping up in Borneo in 1964, when it was mostly jungle, now it’s not. There are wildlife sanctuaries, as soon as you say that you know something has gone drastically wrong. Here we have it, Seven Worlds, One Planet, has a didactic...