"Thousands of chunks of material from the comet would have rained down on Earth, each one releasing the energy of a one megaton nuclear bomb. The impacts would have triggered wildfires covering whole continents, filling the atmosphere with smoke and soot and blotting out the Sun.
What caused a sudden cooling of up to 8C just as the Earth was warming at the end of the last ice age has puzzled scientists."
An early speech from Al Gore?
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