The movie was produced duringthe end of the conflict in Viet Nam, during the height of the cold war. It was also the time of the "Age of Aquarius", the peace movement, and the free rights movement. The feel of the day was very anti-war and anti government, but there was a lot of concern about mankind's destruction of the environment as well.
It was a clear mix of influences. 1970s environmentalism and the success of 2001: A Space Odyssey. However, the book, as I remember it, talks about nuclear waste and war (not necessarily nuclear war --but could be). In any case, I shouldn't quibble about specific detail, suffice to say: earth has been ruined by man's wastefulness.
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