Frozen Planet is a 2011 British nature documentary series, co-produced by the BBC and The Open University. It was filmed by the BBC Natural History Unit. The production team, which includes executive producer Alastair Fothergill and series producer Vanessa Berlowitz, were previously responsible for the award-winning series The Blue Planet (2001) and Planet Earth (2006), and Frozen Planet is billed as a sequel of sorts. David Attenborough returns as narrator. It is distributed under licence by the BBC in other countries, Discovery Channel for North America, ZDF for Germany, Antena 3 for Spain and Skai TV for Greece. The seven-part series focuses on life and the environment in both the Arctic and Antarctic. The production team were keen to film a comprehensive record of the natural history of the polar regions because climate change is affecting landforms such as glaciers, ice shelves, and the extent of sea ice. The series was met with critical acclaim and holds a Metacritic score of 91/100. Whilst the series was broadcast in full in the UK, the BBC chose to make the series' seventh episode, which focuses on climate change, optional for syndication in order to aid sales of the show in countries where the issue is politically sensitive. The US Discovery Channel originally announced that they would air only the first six episodes of the show, but they later added the seventh episode to their schedule. In 2012, the US broadcast won four Emmy Awards, including Outstanding Nonfiction Series. A sequel titled Frozen Planet II began aring in September 2022, which covers more frozen habitats than just the polar regions, while also emphasizing more on the threat of climate change. Filming Frozen Planet finished filming in 2010 and focused on the challenges facing polar bears and Arctic wolves in the north and Adelie penguins and wandering albatrosses in the south, although many other storylines are developed. After an introductory episode, the subsequent four episodes depict the changing seasons at the poles, before an episode focusing on mankind's activities there. The final episode, "On Thin Ice", examines how global warming is affecting the polar regions. Filmmakers worked in new locations, including Antarctica's active volcanoes and the Russian Arctic. Sequences captured include migrating eider ducks, footage of a fur seal colony from the air, and pack hunting of seals by killer whales. The aerial photography used the Cineflex and Gyron cameras pioneered on Planet Earth,