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I renamed this article to remove the plural. Astudent 14:21, 2004 Oct 15 (UTC)
Why does the article state in the introduction that it isn't a closed system because it can exchange energy with its surroundings, when the article for closed system states a closed system can exchange energy with its surroundings? I will remove the offending sentence. 203.211.99.87 00:03, 28 April 2007 (UTC)
"Although the Earth itself fits this definition, the term is most often used to describe much smaller manmade ecosystems." [24 May 2009] This is false. The Earth is not a closed ecological system. The ecology of the Earth relies on the sun, the moon (tides), stars (animal navigation) and more. - Trevor Blake
In movies as Sunshine (2007 film), life support systems are shown.
PS: I don't now if its a closed ecological or controlled ecological life support system (please include in appropriate article if someone knows this)
There are some close systems, like Movile Cave, where the ecosystem uses chemosynthesis as a source of energy. bogdan ( talk) 00:39, 31 January 2008 (UTC)
• Rendezvous with Rama, (book), Arthur C Clark 1973
• Silent Running, (film), 1972
Admittedly old, but ...