David Attenborough and scientist Johan Rockström examine Earth's biodiversity collapse and how this crisis can still be averted.
Dr Xand Van Tulleken and Raksha Dave investigate the Great Smog of 1952 - the deadliest environmental disaster ever recorded and one of the world's worst peacetime catastrophes. Lasting just over four days, the Great Smog plunged London into a terrifyingly murky gloom - the acrid pollution seeping into homes, leaving Londoners gasping for breath, shutting down transport and emergency services, and overwhelming hospitals and undertakers alike.
Martin Boudot, investigative journalist, investigates major environmental scandals around the world: river contamination, air pollution, radioactivity, illegal exploitation of resources, toxic waste...