Glacial retreat at the Athabasca glacier | Greta Thunberg: A Year to Change the World
Professor John Pomeroy describes the causes of glacial retreat.Tweet
Britain's Wild Weather | Panorama
Justin Rowlatt visits communities around Britain battered by this year's extreme weather - unprecedented rainfall, sunshine and sustained high temperatures - to find out how they have coped.
Episode 3 | Great Barrier Reef with David Attenborough
David Attenborough uncovers the ways in which scientists are trying to preserve the Great Barrier Reef and embarks on an ambitious exploration of his own.