Skip to comments.Climate alarmists lose another piece of evidence
Posted on 06/11/2007 10:11:38 AM PDT by Neville72
Don't look now, but another big chunk of the "evidence" for man-made global warming suddenly disappeared. Poof! Researchers just reported that the world's most recent case of "abrupt climate change"which occurred a mere 12,000 years agowas probably due to a comet strike, not to "climate sensitivity."
The Younger Dryas occurred as an Ice Age was ending. As the climate began to warm, a huge and sudden rush of fresh meltwater broke out from the Great Lakes and swept out to sea. The water surge was monumental enough that the meltwater lowered the salinity of the ocean, shut down the Atlantic conveyor currents, which disperse the planet's heat, and threw the northern hemisphere back into another thousand years of Ice Age. It raised temperatures near Greenland by a startling 15 degrees C, even as it doubled annual rainfall.
Modern climatologists have savored the Younger Dryas event as massive evidence of what comes when we push the planet's climate too close to a "tipping point." Further human-driven warming, they say, will make such abrupt climate changes more likely, with searing droughts, torrential rainfall, and extreme heat.
The National Academy of Sciences issued a 2002 report titled Abrupt Climate Change: Inevitable Surprises, which said abrupt climate changes have been especially common when the climate system was being forced to change most rapidly. According to that theory, greenhouse warming today could be drastically increasing risks from climate change.
At least, that's what the experts said until the latest meeting of the American Geophysical Union in Acapulco on May 23rd when James Kennett of the University of California/Santa Barbara presented evidence of a dramatically different cause for the Younger Dryas event: a comet that struck somewhere near the Great Lakes.
"Highest concentrations of extraterrestrial impact materials occur in the Great Lakes area and spread out from there," Kennett says. "It would have had major effects on humans. Immediate effects would have been in the North and East, producing shockwaves, heat, flooding, wildfires, and a destruction and fragmentation of the human population."
Paleontologists had assumed a huge lake of meltwater accumulated near the Great Lakes due to the Ice Age ending, but had never located its possible site. Nor have they explained a thin layer of charred sediment found throughout North America that dates from 12,000 years ago. The sediment layer contains carbon spheres whose creation would have required temperatures of at least 4000 C. Electron microscopes reveal that the carbon beads contain tiny diamonds whose creation would have required enormous temperatures and pressures.
The U.S. sediment layer does not contain much iridium, which is the telltale signal of an asteroid strike. That argues for a comet, made up primarily of "dirty ice," rather than an asteroid like the one which hit Mexico's Yucatan Peninsula 65 million years ago and wiped out the dinosaurs.
Kennett says the ice sheet could have absorbed the impact of the comet's "dirty ice," even as the comet's heat produced the flood of meltwater. Kennett says the comet may have destroyed 15 mammal species and might have left only a few surviving humans from North America's early Clovis culture. America's bison survived, but much smaller in size and with a remarkable similarity in their DNAindicating that they descended from a small group of comet survivors.
The comet theory comes as a crushing blow to the climate alarmists. It follows the publication of Unstoppable Global WarmingEvery 1,500 Years, which assembles the historic and scientific evidence of a long, natural climate cycle that swings temperatures about 2-4 degrees C over its lifetimeaccounting for the Medieval Warming, the Roman Warming and the Holocene Warming 5,000 years ago. Then came Henrik Svensmark's demonstration at the Danish Space Research Institute, of how cosmic rays link changes in the sun's irradiance to the formation of the low, wet clouds that cover more than 20 percent of the earth. The clouds are nature's thermostats, deflecting more or less heat back out to space depending on the sun's strength.
Now the alarmists have lost the "abrupt climate change" of the Younger Dryas. More and more, recent science is pointing to our modern warming as being part of a 1500-year cycle that stretches back at least a million years.
If the Younger Dryas was caused by a comet, perhaps we should rethink being frightened by the neighbor's SUV.
Dennis T. Avery was a senior policy analyst for the U.S. State Department, where he won the National Intelligence Medal of Achievement. He is the co-author, with atmospheric physicist Fred Singer, of the book, Unstoppable Global WarmingEvery 1500 Years, available from Rowman & Littlefield. Readers may write him at the Center for Global Food Issues, Post Office Box 202, Churchville, VA 24421
If the Younger Dryas was caused by a comet, perhaps we should rethink being frightened by the neighbor's SUV.Oh, yee of little faith!
Are you too blind to see that maybe, just maybe, that comet was CAUSED by the neighbor's SUV?
(None are so blind as those who refuse to squeeze facts into pre-set ideologies.)
One major volcanic eruption puts more CO2 into the atmosphere than all human sources combined. How we gonna put a muzzle on that? BTW the answer is we’re not gonna be able to do it.
Jeez, look at that ugly bugger. I had forgotten all about those.
What model is it? Is the “75” on the windshield the year OR how much the owner had to pay someone to take it off his hands. LOL
Since it has been demonstrated that Carbon Dioxide increases in the atmosphere lag the global temperature by some 800 years has anyone bothered to investigate if The Carbon dioxide levels aren’t actually a natural regulatory mechanism that helps maintain the the planet’s equilibrium and if we continue to mess with it we will upset the balance in the the exact opposite to the original intended consequence?
A muzzle and a giant cork to close up the two huge pie holes on L. Ron Gore might be a start ;)
Well, yeah but the computer models have long ago stopped predicting we would see 20 feet rise in sea level, but that does not stop Al Gore from making a movie about it. Global Warmers do not let facts get in their way of putting out doom and gloom propaganda.
Did comet start deadly cold snap?
Canada.com | Monday, May 14, 2007 | Margaret Munro
Posted on 05/16/2007 6:00:33 PM EDT by Mike Darancette
Diamonds tell tale of comet that killed off the cavemen
Guardian | 5-20-07 | Robin McKie
Posted on 05/20/2007 7:50:33 PM EDT by Renfield
Catastrophic Comet Chilled and Killed Ice Age Beasts (and Clovis people)
Live Science | 05/21/07 | Jeanna Bryner
Posted on 05/22/2007 1:16:48 AM EDT by TigerLikesRooster
Oregon Researchers Involved In New Clovis-Age Impact Theory (More)
Posted on 05/23/2007 5:30:19 PM EDT by blam
Comet May Have Doomed Mammoths
Red Orbit | 5-26-07 | Betsy Mason
Posted on 05/26/2007 9:12:53 AM EDT by Renfield
And who caused the “comet”? But of course, human life.
PP43A-06 The Younger Dryas ET Impact Theory and Terminal Pleistocene Mammalian Extinctions in North AmericaPP05: New Insights into Younger Dryas Climatic Instability, Mass Extinction, the Clovis People, and Extraterrestrial ImpactsDespite decades of intensive study and debate, no consensus has been reached on what caused the extinction of North America's mammalian megafauna at the end of the Pleistocene. In a scholarly standoff, prominent scientists have shown that neither "human overkill" or "climate change" models adequately account for the patterns found in the paleontological and archaeological records of North America. The Younger Dryas ET Impact theory may dramatically alter this debate, adding a catastrophic trigger to help explain the rapid extinction of many large mammals about 12,900 years ago. New data suggest that an extraterrestrial impact focused in northern and eastern North America may have devastated the megafauna through: (1) direct mortality caused by the impacts shock wave, debris, and massive wildfires; (2) dramatic reduction of terrestrial food supplies, rapid climatic change, and ecological reorganization; and (3) coup-de-grace effects of surviving human populations rapidly expanding after the impact.
The deglaciation that followed the last ice age period was abruptly and dramatically interrupted ~12,900 years ago by widespread cooling that marks the onset of the Younger Dryas Cool Episode, an apparent climatic anomaly in Quaternary deglaciation behavior. Much evidence shows that the Younger Dryas onset was marked by abrupt changes in ice sheet configuration, diversion of North American flood-waters to the northern Atlantic, the sudden emptying of proglacial lakes, and the reorganization of thermohaline circulation that may have triggered severe cooling. Nevertheless, significant questions have recently emerged about timing and direction of major freshwater flows to the oceans, in turn raising questions about the triggering mechanism for the Younger Dryas. The onset of the Younger Dryas also appears to have coincided with massive, widespread and punctuated changes in animal biota and Paleolithic cultural development centered in North and South America. This is represented by the well-known extinction of the megafauna of the Americas, including mammoths, horses and groundsloths (the most recent of all mass extinctions) and the termination of Clovis and certain other contemporaneous Paleolithic human cultures. The cause of these changes is also highly controversial and much debated, but is likely tied to the severe environmental changes that occurred at the beginning of the Younger Dryas. Nevertheless, some researchers consider these to be coincidental events, while others link the two as cause and effect. Another hypothesis attributes the extinctions to overhunting by Clovis people and other Paleolithic hunters or to pandemics associated with human migrations. However, all these hypotheses appear to fall short in satisfactorily explaining much available evidence. A new hypothesis posits that Younger Dryas cooling was instead triggered by extraterrestrial impacts that caused ice sheet destabilization, flood-water rediversion and changes in ocean circulation. This work offers newly uncovered evidence for ET impact at 12.9 ka including end-Clovis age sediments throughout North America with high levels of Iridium, magnetic and carbon, spherules, glass-like carbon, fullerenes, and ET noble gas ratios often in association with carbonaceous black layers and succeeded by black mats with unusual biota In this session, we invite abstracts that will explore the strengths and weaknesses of existing and new hypotheses that attempt to explain the cause of the Younger Dryas and of associated changes in the global environmental system, the associated extinctions, and of human cultural changes. We welcome all abstracts exploring new perspectives on the chronology, stratigraphic succession and potential interconnections between a wide-range of processes that appear to have been associated with the Younger Dryas Episode. These include abrupt climatic change, ice-sheet deglaciation, flood-water rerouting, surficial geology, iceberg discharge, ocean reorganization including thermohaline circulation, and sea-level change. Also critical is the timing and nature of major extinction, Paleolithic cultural succession and impact-related phenomena.
Do you have a source or link for that? Good NFO to combat the hysteria.
OK, he said slowly.
What part of the 1500 year cycle are we in then? Medieval Warming would have to be defined fairly closely in order that we establish whether we are the end of the current warming cycle, the peak, or a new beginning.
Or whether we simply are watching the sun go nova a bit earlier than the astronomers predicted.
(After all, He told Noah that He’d never destroy the earth by flood again. That leaves fire as an obvious option.) 8<)
I think it is a ‘75. My in-laws had one a nice mustardy yellow color.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.