Originally broadcast in 2001 on the television series: Horizon.
Summary:
Discusses research into the theory that 600 million years ago global glaciation occurred on the earth. Scientists across the world are slowly accepting this controversial theory -- that the earth was deep-frozen for ten million years, almost all life was wiped out, but after the freeze, the earth warmed up rapidly about 600 million years ago, and there emerged the first complex creatures on earth. Scientists now believe that the so-called 'snowball earth' theory could hold the key to the evolution of life on this planet. But this theory could have huge implications.
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