More than 200 million years ago, a cataclysmic event known as
the Permian extinction destroyed more than 90% of all species and
nearly 97% of all living things. Its origins have long been a
puzzle for paleontologists, and during the 1990s and the early part
of this century a great battle was fought between those who thought
that death had come from above and those who thought something more
complicated was at work.
Paleontologist Peter D. Ward, fresh from helping prove that an
asteroid had killed the dinosaurs, turned to the Permian problem,
and he has come to a stunning conclusion. In his investigations of
the fates of several groups of mollusks during those extinctions
and others, he discovered that the near-total devastation at the
end of the Permian was caused by rising levels of carbon dioxide
leading to climate change. But it's not the heat (nor the humidity)
that's directly responsible for the extinctions, and the story of
the discovery of what is responsible makes for an fascinating,
globe-spanning adventure.
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