At the age of 97, David Attenborough could be forgiven for wanting to put his feet up in front of the fire. Instead, the 97-year-old revered presenter has signed up to present the third series of Planet Earth. The Guardian newspaper reports that Attenborough has already begun filming the new series of the BBC’s award-winning natural history programme, expected to air later this year on BBC One. The show’s executive producer, Mike Gunton, told The Guardian: “Planet Earth wouldn’t be Planet Earth without David, so I’m delighted he is presenting the third series. As ever, he has brought his huge...