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most mass extinctions were caused by gradual climate change

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nerak
User ID: 75523
3/30/2006 12:04 PM

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most mass extinctions were caused by gradual climate change

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Another view of mass extinctions is heard
SEATTLE, March 29 (UPI) -- A University of Washington paleontologist says most mass extinctions were caused by gradual climate change and not catastrophic asteroid impacts.

And that, said Peter Ward, means we might be in the midst of another mass extinction.

Other paleontologists, however, disagree with Ward and the dispute is turning into a full-scale academic brawl.

"It's a shoot-out at the OK Corral," said Ward, who presented his climate change theory during NASA's Astrobiology Science Conference in the nation's capital last week.

He says five major extinctions have occurred during the past 500 million years -- the Ordovician, the Devonian, the Permian, the Triassic and the Cretaceous. There has been widespread agreement that the Cretaceous extinction, which wiped out the dinosaurs 65 million years ago, was triggered by an asteroid impact.

"It's such a simple idea that for 20 years we just assumed the same was true for all extinctions," says Ward.

But he says there's mounting evidence the Permian extinction around 250 million years ago was caused by huge volcanic eruptions in Siberia, which led to catastrophic climate change. Ward believes such "greenhouse extinctions" are the rule and asteroid impacts the exception.

time flies in a linear mind

Halcyon Dayz
User ID: 75574
3/30/2006 12:38 PM

Re: most mass extinctions were caused by gradual climate change

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Before Cosmic Catastrophism climate
change was the most common theory.
One mechanism was a continent drifting
to a pole, collecting land ice and
triggering a period of ice-ages.
book

An idea is not responsible for the people who believe in it. - Don Marquis
To defy the authority of empirical evidence is to disqualify oneself as someone worthy of critical engagement in a dialogue. - Tenzin Gyatso
Entia non sunt multiplicanda praeter necessitatem - William of Ockham
The truth maybe out there, but lies are inside your head - Terry Pratchett
HALCYON DAYS STOP BEING A DIPSHIT ALL YOUR LIFE YOU MORON - Anonymous Coward

Sinanju nli
User ID: 67144
3/30/2006 12:41 PM

Re: most mass extinctions were caused by gradual climate change	Quote
"Before Cosmic Catastrophism climate change was the most common theory. One mechanism was as continent drifting to a pole, collecting land ice and triggering a period of ice-ages." However, that was proven to be incorrect. Dinosaurs lived on the continent of Antarctica. This paleoentologist in the article seems to have a political agenda. No wonder his peers disagree with him.

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