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Columbus' arrival linked to carbon dioxide drop

Depopulation of Americas may have cooled climate

By
10:43am, October 13, 2011

MINNEAPOLIS — By sailing to the New World, Christopher Columbus and other explorers who followed him may have set off a chain of events that cooled Europe’s climate.

The European conquest of the Americas decimated the people living there, leaving large areas of cleared land untended. Trees that filled in this territory pulled billions of tons of carbon dioxide from the atmosphere, Stanford University geochemist Richard Nevle reported October 11 at the Geological Society of America annual meeting. Such carbon dioxide removal could have diminished the heat-trapping capacity of the atmosphere and cooled the climate, Nevil and his colleagues have previously reported.

“We have a massive reforestation event that’s sequestering carbon … coincident with the European arrival,” said Nevle.

Tying together many different lines of evidence, Nevle estimated how much carbon all those new trees would have consumed. He says it was enoug

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