Earth teems with life, but imagine it disappearing in one go, a victim of catastrophic events that leave the planet uninhabitable. National Geographic Channel looks at the mass extinctions of the Permian and Ordovician periods and that of the dinosaurs, examining what caused them, in order to discover whether they could happen again.
From asteroid strikes, gamma ray explosions to massive volcanic activity that could rip open the earth, could humans be wiped out or are we already in the middle of a man-made mass extinction?
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