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Source
Alternative 3 is a television programme, broadcast in the UK in (June of) 1977
It was claimed that scientists had determined that the Earth's surface would be unable to support life for much longer, due to pollution leading to catastrophic climate change. It was proposed that there were three alternatives to this problem: the first involved the detonation of nuclear bombs in the stratosphere in order to allow the pollution to escape. The second alternative was the construction of an elaborate underground city. The third alternative, the so-called "Alternative 3", was to populate Mars via a waystation on the Moon