Sir David Attenborough joins Instagram to warn ‘the world is in trouble’

Sir David Attenborough in the Maasai Mara in Kenya while filming David Attenborough: A Life On Our Planet (Conor McDonnell/WWF-UK/PA)
Sir David Attenborough in the Maasai Mara in Kenya while filming David Attenborough: A Life On Our Planet (Conor McDonnell/WWF-UK/PA)