Democratic Underground Latest Greatest Lobby Journals Search Options Help Login
Google

New Recipe: How To Make A Mass Extinction

Printer-friendly format Printer-friendly format
Printer-friendly format Email this thread to a friend
Printer-friendly format Bookmark this thread
This topic is archived.
Home » Discuss » Topic Forums » Environment/Energy Donate to DU
 
RestoreGore Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Oct-28-06 09:59 AM
Original message
New Recipe: How To Make A Mass Extinction
Edited on Sat Oct-28-06 10:00 AM by RestoreGore
Mr. Gore is so right about the "planetary emergency" we now face, and that is why this requires a higher calling on all our parts to see it and act. This is so beyond any political rhetoric.
~~~~~~~
http://news.yahoo.com/s/space/20061027/sc_space/newreci...

Michael Schirber
Special to LiveScience
LiveScience.com
Fri Oct 27, 1:30 PM ET

Apocalypses may not be all fire and brimstone. A growing number of paleontologists say that Earth-smashing meteors cannot take all the blame for the many mass extinctions that dot our planet's fossil record. The true causes seem to be more complex. "The impact model has been so successful because it's easy to explain and easy to understand," said Nan Arens of Hobart and William Smith College in Geneva, NY. "However, the simple answer isn't always the best one."

At the annual meeting of the Geological Society of America this week in Philadelphia, Arens and others argued that the combined punch of volcanoes, climate change and impacts leaves many species teetering on the brink of extinction. One final blow brings collapse.

The same scenario could be happening now.

Skip to:

Common diagnosis

A sick Earth succumbing to a final shock is apparently a common extinction formula. Arens and her colleagues analyzed geologic data from the last 488 million years and found more species died out when the environment was first stressed and then stung. Specifically, the researchers compared stress-inducing volcanic activity and catastrophic meteor impacts. Only when the Earth experienced both did extinction rates significantly increase.

"Periods of stress are going to reduce population sizes," Arens said. With reduced numbers, "species are vulnerable to pulse catastrophes."
On the flip side, an unstressed environment is resilient to geologic and climatic disasters because life is diverse and geographically spread out.

And now?

Applying their model to the present, Arens and her collaborators speculate that human activity has both stressed the environment with agriculture and shocked it with fossil fuel burning. Whether or not this is an accurate description, both Bottjer and Keller agree that we are in a precarious situation.

"Under conditions any disaster that might strike (impact or volcanism or major greenhouse warming), which ordinarily would not cause major extinctions, will put much of Earth's biota at risk of extinction," Keller said.

Related News

Al Gore: Earth is in 'Full-Scale Planetary Emergency'
The Perils of Being Huge: Why Large Creatures Go Extinct
Humans Fuel Worst Extinction Since End of Dinosaurs
Scientists Debate Dinosaur Demise
Explore Dinosaurs

Images: Drawing Dinos
Images: Dinosaur Fossils
Dinosaurs that Learned to Fly
The Biggest Carnivore: Dinosaur History Rewritten
How Dinosaurs Might Have Walked
A Brief History of Dinosaurs
All About Dinosaurs

Original Story: New Recipe: How to Make a Mass Extinction

Visit LiveScience.com for more daily news, views and scientific inquiry with an original, provocative point of view. LiveScience reports amazing, real world breakthroughs, made simple and stimulating for people on the go. Check out our collection of Science, Animal and Dinosaur Pictures, Science Videos, Hot Topics, Trivia, Top 10s, Voting, Amazing Images, Reader Favorites, and more. Get cool gadgets at the new LiveScience Store, sign up for our free daily email newsletter and check out our RSS feeds today!
Printer Friendly | Permalink |  | Top
Warpy Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Oct-28-06 10:05 AM
Response to Original message
1. New research is indicating the dinosaurs went out
with more of a whimper than a bang. Climate change had been causing a dieoff for a few centuries when the asteroid and tsunami finished them off. Scientists had long wondered why there wasn't a mass of dinosaur bones right at the iridium layer. The slow dieoff is why.

That asteroid probably did them a favor. Life must have been miserable for them toward the end.

The question is whether or not we'll be able to cope with the changes in climate. There will certainly be a lot fewer of us in a few hundred years, and that's a good thing. Getting to a lower, sustainable population will be miserable.

Gore still thinks it's preventable. I no longer think so.
Printer Friendly | Permalink |  | Top
 
DU AdBot (1000+ posts) Click to send private message to this author Click to view 
this author's profile Click to add 
this author to your buddy list Click to add 
this author to your Ignore list Wed Apr 16th 2014, 03:00 PM
Response to Original message
Advertisements [?]
 Top

Home » Discuss » Topic Forums » Environment/Energy Donate to DU

Powered by DCForum+ Version 1.1 Copyright 1997-2002 DCScripts.com
Software has been extensively modified by the DU administrators


Important Notices: By participating on this discussion board, visitors agree to abide by the rules outlined on our Rules page. Messages posted on the Democratic Underground Discussion Forums are the opinions of the individuals who post them, and do not necessarily represent the opinions of Democratic Underground, LLC.

Home  |  Discussion Forums  |  Journals |  Store  |  Donate

About DU  |  Contact Us  |  Privacy Policy

Got a message for Democratic Underground? Click here to send us a message.

© 2001 - 2011 Democratic Underground, LLC