Question: What documentary did the environmental writer for The Guardian work on?

Context paragraphs:
Bill Belleville: Bill Belleville is an environmental writer, documentary filmmaker and lecturer.

George Monbiot: George Joshua Richard Monbiot ( ; born 27 January 1963) is a British writer known for his environmental and political activism.  He writes a weekly column for "The Guardian", and is the author of a number of books, including "Captive State: The Corporate Takeover of Britain" (2000) and "Feral: Searching for Enchantment on the Frontiers of Rewilding" (2013).  He is the founder of The Land is Ours, a peaceful campaign for the right of access to the countryside and its resources in the United Kingdom.

Ian McKay (writer): Ian McKay (born 1962) is an English environmental writer, critic, publisher, and translator.  A former editor of "Contemporary Art" magazine, and the founder-editor of "The Journal of Geography and Urban Research", throughout the 1990s he was best-known for his writings on the arts of Eastern Europe, being cited as the first British art critic to emphasize the negative impact of the western art market in that region.  Throughout the 1990s and early-2000s, he was a contributor to a wide range of art journals, as well as writing on subjects relating to photography, cinema, and music.  Since 2007 his publishing activities have mainly centred on UK Rural Affairs, and the environment however.  Though periodically he continues to publish works of art criticism, his most recent publications concern social justice in rural Britain, as well as environmental conservation in the wider European sphere.  He has also worked as an academic in several UK universities.

Tim O'Riordan: Tim O'Riordan OBE DL FBA (born (1942--)21 1942 ) is a British geographer who is Emeritus Professor of Environmental Sciences at the University of East Anglia (UEA) and a prominent British environmental writer and thinker.

Biodiversity of Westchester County, New York: There are 1,168 species of vascular plants in Westchester County, according to the Parks Department.  Literary environmental writer Alex Shoumatoff hailed it as the "most richly diversified deciduous forest in the world" in a 1978 "The New Yorker" profile, at the time estimating 4,200 species.

Paul Harrison (pantheist): Paul Harrison is an environmental writer, author of several books and reports on environment and development, and the founder and president of the World Pantheist Movement.

Ginger Strand: Ginger Strand is an American essayist, novelist, environmental writer, and historian.  Her 2005 debut novel "Flight" was adapted from several of her short stories.  Her published books of non-fiction include "Inventing Niagara: Beauty, Power, and Lies" in May 2008 and "Killer on the Road: Violence and the American Interstate" in 2012.

The Planet (film): The Planet is a Swedish documentary film on environmental issues, released in 2006.  The film was made by Michael Stenberg, Johan Söderberg and Linus Torell for the big screen and was shot in English to reach an international audience.  It includes interviews with 29 environmental scientists and experts including Stephen Peake, Herman Daly, Lester Brown, Gretchen Daily, Mathis Wackernagel, Norman Myers, Jill Jäger, George Monbiot, Robert Costanza, Will Steffen, and Jared Diamond.

Richard Hamblyn: Richard Hamblyn (born 1965) is a British environmental writer and historian.  He is a lecturer in the Department of English and Humanities at Birkbeck, University of London, and has contributed to the "Sunday Times", "The Guardian", the "Independent", the "Times Literary Supplement" and the "London Review of Books".

The God Species: The God Species: Saving the Planet in the Age of Humans (alternatively, "The God Species: How the Planet Can Survive the Age of Humans" (U.S.) or "The God Species: How Humans Really Can Save the Planet..." (paperback)) is a 2011 book by environmental writer Mark Lynas.  It argues that since the Earth has entered an age where several of its systems are in the control of humanity—the Anthropocene—it is now up to humans to use this power wisely.  The book challenges several beliefs usually held by environmentalists, arguing that technology like nuclear power and genetic engineering are useful and necessary tools to keep the Earth system within planetary boundaries, and that the Green movement's insistence on lifestyle changes and opposition to economic growth are unlikely to work.

Supporting paragraphs: The Planet (film) George Monbiot
Answer: The Planet