Question: is China Blue or Alaska Wilderness Lake the older documentary film?

Context articles: China Blue
Qinghai Lake
Bitter Seeds
Borealis (film)
China Heavyweight
Guangzhou International Documentary Film Festival
Alaska: Spirit of the Wild
Mammalian (film)
Alaska Wilderness Lake
Note by Note: The Making of Steinway L1037

China Blue is a 2005 documentary film directed by Micha Peled.
 It follows the life of Jasmine Li, a young seventeen-year-old worker from Sichuan province, in a Chinese jeans factory, "Lifeng Clothes Factory" (丽锋服饰制衣有限公司) in Shaxi, Guangdong producing Vigaze Jeans (a company based in Istanbul, Turkey ), hence the title.
 Jasmine earned about half a yuan for one hour's work (which amounted to about six US cents).
Qinghai Lake (), Kokonor (Mongolian: Хөх нуур ) or Tso Ngonpo (Tibetan: མཚོ་སྔོན་པོ། ) is the largest lake in the People's Republic of China.
 Located in Qinghai province on an endorheic basin, Qinghai Lake is classified as a saline and alkaline lake.
 Qinghai Lake has a surface area of 4317 km2 ; an average depth of 21 m , and a maximum depth of 25.5 m as measured in 2008.
 The current Chinese name "Qinghai," the older Mongolian name "Kokonor", and the Tibetan name translate to "Green Sea", "Blue Lake" and "Teal Sea", respectively.
 Qinghai Lake is located about 100 km west of the provincial capital of Xining (Tib:Ziling ཟི་ལིང་།) at 3205 m above sea level in a hollow of the Tibetan plateau.
 Twenty-three rivers and streams empty into Qinghai Lake, most of them seasonal.
 Five permanent streams provide 80% of total influx.
Bitter Seeds is a 2011 documentary film by American filmmaker and director and political commentator Micha Peled.
 The film is the third part of Peled's globalization trilogy after "" (2001) and "China Blue" (2005).
Borealis is a 2008 documentary film by Frank Wolf that follows two friends on a 3,100 km canoe adventure through the northern Boreal forest of Manitoba and Ontario.
 The film looks at the industrial threats to the pristine, vast wilderness north of the 51st parallel from the perspective of those who live in the region.
 The film is notable for its quirky and humorous tone in spite of the subject matter.
 It won the Grand Prize as well as Prize for Best Canadian Film at the 2009 Vancouver International Mountain Film Festival and was one of the Top Ten Most Popular Canadian Films at the 2008 Vancouver International Film Festival.
 It aired multiple times on CBC's documentary in Canada in 2009-10.
China Heavyweight (also known by its Chinese title 千錘百煉) is a 2012 documentary film by the Chinese-Canadian documentary film director Yung Chang and released by EyeSteelFilm.
 It is Yung Chang's second long feature documentary film after "Up the Yangtze" from 2007.
The Guangzhou International Documentary Film Festival () is a state-endorsed documentary film festival held in the city of Guangzhou, China.
 It is one of the biggest documentary film festivals in China.
Alaska: Spirit of the Wild is a 70mm American documentary film featuring the landscape and wildlife of Alaska.
 It is narrated by Charlton Heston and released to IMAX theaters in 1997.
Mammalian is a 2010 documentary film that follows Frank Wolf and Taku Hokoyama as they take on a 2,000 km canoe journey through the largest wilderness area in North America.
 Their route travels from Yellowknife, YT to Rankin Inlet, NT through a region with one of the highest concentrations of land mammals on earth.
 The pair encounter Arctic wolves, the caribou migration, musk ox and- most importantly- make the first ever recording of a rare and elusive creature not previously thought to exist in northern Canada.
 With a sense of humour and purpose, they track down politicians, First Nation chiefs, elders and others living in the few communities that frame the wilderness in order to present a clear picture of the area and the issues that face the land and its people.
 The film was the winner of the 'Best Environment Film' at the 2011 Kendal Mountain Festival and was one of the Top Ten Most Popular Canadian Films of the 2010 Vancouver International Film Festival.
 It aired on CBC's documentary (TV channel) in Canada multiple times through 2013.
Alaska Wilderness Lake is a 1971 American documentary film produced by Alan Landsburg.
 It was nominated for an Academy Award for Best Documentary Feature.
Note by Note: The Making of Steinway L1037 is an independent documentary film that follows the construction of a Steinway concert grand piano (model D-274) over a year, from the search for wood in Alaska to a display at Manhattan's Steinway Hall.
 The documentary film received its U.S. theatrical premiere at New York's Film Forum in November 2007.