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Although human hunting played a part in the demise of the woolly mammoth about 10,000 years ago, homo sapiens were but bit players in a global drama involving climate change, comet impact and a multitude of other factors, scientists have found in separate studies. Previous research had blamed their demise on tribal hunting. But new findings “pretty much dispel the idea of any one factor, any one event, as dooming the mammoths,” said Glen MacDonald, a researcher and geographer at the University of California in Los Angeles, to LiveScience.com. In other words, hunting didn’t help, but it was not instrumental....

Posted on June 16, 2012 by Anthony Watts WUWT readers may recall this recent story: New evidence of Younger Dryas extraterrestrial impact The story below provides much more detail about the Younger Dryas event and the split that has developed in the scientific community over the cause. I’ve added this graph below from NCDC to give readers a sense of time and magnitude of the event. – Anthony The Younger Dryas cold interval as viewed from central Greenland. From:Quaternary Science Reviews Volume 19, Issues 1-5, 1 January 2000, Richard B. AlleyGuest Post By: Rodney Chilton www.bcclimate.com A consideration of many...

Did Comets Cause Ancient American Extinctions?Anne Casselman for National Geographic NewsMay 6, 2008 Debate has heated up over a controversial theory that suggests huge comet impacts wiped out North America's large mammals nearly 13,000 years ago. The hypothesis, first presented in May 2007, proposes that an onslaught of extraterrestrial bodies caused the mass extinction known as the Younger Dryas event and triggered a period of climatic cooling. The theory has been debated widely since it was introduced, but it drew new scrutiny in March at the annual meeting of the Society for American Archaeology annual meeting in Vancouver, Canada. Stuart...

Nanodiamonds found across North America suggest that major climate change could have been cosmically instigatedRoughly 12,900 years ago, massive global cooling kicked in abruptly, along with the end of the line for some 35 different mammal species, including the mammoth, as well as the so-called Clovis culture of prehistoric North Americans. Various theories have been proposed for the die-off, ranging from abrupt climate change to overhunting once humans were let loose on the wilds of North America. But now nanodiamonds found in the sediments from this time period point to an alternative: a massive explosion or explosions by a fragmentary...

Central Mexico’s Lake Cuitzeo contains melted rock formations and nanodiamonds that suggest a comet impacted Earth around 12,900 years ago, scientists say. CREDIT: Israde et al. (2012) New evidence supports the idea that a huge space rock collided with our planet about 13,000 years ago and broke up in Earth's atmosphere, a new study suggests. This impact would have been powerful enough to melt the ground, and could have killed off many large mammals and humans. It may even have set off a period of unusual cold called the Younger Dryas that began at that time, researchers say. The...

New data disproves the recent theory that a large comet exploded over North America 12,900 years ago, causing a shock wave that travelled across North America at hundreds of kilometres per hour and triggering continent-wide wildfires. Dr Sandy Harrison from the University of Bristol and colleagues tested the theory by examining charcoal and pollen records to assess how fire regimes in North America changed between 15 and 10,000 years ago, a time of large and rapid climate changes. Their results provide no evidence for continental-scale fires, but support the fact that the increase in large-scale wildfires in all regions of...

"These findings are inconsistent with the alternative and already hotly debated theory that overhunting by Clovis people led to the rapid extinction of large mammals at the end of the ice age, the research team argues in the PNAS paper."

Ice Age Ends Smashingly: Did a comet blow up over eastern Canada? Sid Perkins Evidence unearthed at more than two dozen sites across North America suggests that an extraterrestrial object exploded in Earth's atmosphere above Canada about 12,900 years ago, just as the climate was warming at the end of the last ice age. The explosion sparked immense wildfires, devastated North America's ecosystems and prehistoric cultures, and triggered a millennium-long cold spell, scientists say. IT'S IN THERE. A layer of carbon-rich sediment (arrow) found here at Murray Springs, Ariz., and elsewhere across North America, provides evidence that an extraterrestrial object...

We report the discovery in Lake Cuitzeo in central Mexico of a black, carbon-rich, lacustrine layer, containing nanodiamonds, microspherules, and other unusual materials that date to the early Younger Dryas and are interpreted to result from an extraterrestrial impact. These proxies were found in a 27-m-long core as part of an interdisciplinary effort to extract a paleoclimate record back through the previous interglacial. Our attention focused early on an anomalous, 10-cm-thick, carbon-rich layer at a depth of 2.8 m that dates to 12.9 ka and coincides with a suite of anomalous coeval environmental and biotic changes independently recognized in other...

Startling evidence has been found which shows mammoth and other great beasts from the last ice age were blasted with material that came from space.Eight tusks dating to some 35,000 years ago all show signs of having being peppered with meteorite fragments. The ancient remains come from Alaska, but researchers also have a Siberian bison skull with the same pockmarks. The scientists released details of the discovery at a meeting of the American Geophysical Union in San Francisco, US. They painted a picture of a calamitous event over North America that may have severely knocked back the populations of some...

Geologist Wins Top Science Award March 6, 2006 10:00 p.m. EST Yvonne Lee - All Headline News Staff Reporter Reno, Nevada (AHN) - Geologist Walter Alvarez will receive the Desert Research Institute's silver medallion and a $20,000 prize. The Associated Press reports the University of California-Berkeley scientist came up with the theory that dinosaurs were killed off when a comet or asteroid crashed into the Earth. President of the institute Stephen G. Wells says, "Until the impact theory was finally proven, Dr. Alvarez and his colleagues were regarded as heretics by the `old guard' in the field of geology." In...

TALE OF ARTHUR POINTS TO COMET CATASTROPHE From The Times, 9 September 2000 http://www.the-times.co.uk BY NICK NUTTALL Arthur: myth links him to fire from the sky THE story of the death of King Arthur and its references to a wasteland may have been inspired by the apocalyptic effects of a giant comet bombarding the Earth in AD540, leading to the Dark Ages, a British scientist said yesterday. The impacts filled the atmosphere with dust and debris; a long winter began. Crops failed, and there was famine, Dr Mike Baillie of Queen's University, Belfast, told the British Association for the Advancement...

From the file of “Things that would really be catastrophic”. Did a meteor have a role in a major shift in Earth’s Climate?The start of the Quaternary period (2.588 million years ago, where the Pliocene became Pleistocene) coincides with evidence of a mega tsunami in the South Pacific.The Eltanin Meteor fell into the South Pacific 2.5 million years ago setting off a (likely) tsunami that was hundreds of meters high and theoretically pushed mass material into the atmosphere which may have contributed to the cooling the globe had already started on. This meteor was hard to detect because it hit...

Two hospice care centers are struggling to make ends meet, and Obamacare’s cuts to Medicare are to blame. Hospices—health care facilities for the terminally ill—along with other Medicare providers are facing Medicare pay cuts. Of the $716 billion in payment reductions, hospice care was hit by a $17 billion payment cut from 2013 to 2022. Now, contrary to all of the misleading claims, this effect is already beginning. San Diego Hospice recently laid off 260 workers, closed a 24-bed hospital, and has recently filed for Chapter 11 bankruptcy. San Diego Hospice’s financial condition is attributed mainly to reduced Medicare reimbursement,...

Edge of Huygens Crater Summary - (Oct 19, 2004) The European Space Agency's Mars Express took this image of the rim of impact crater Huygens, which is 450 km (280 miles) across. By counting craters in the area, researchers have determined that Huygens was blasted out approximately 4 billion years ago, early on in Mars' history when the planet was being heavily bombarded like the rest of the planets in the Solar System. The rim seems to show a tributary system that could have been water runoff in the ancient Martian past. Full Story - This image, taken by the...

Explanation: Stickney Crater, the largest crater on the martian moon Phobos, is named for Chloe Angeline Stickney Hall, mathematician and wife of astronomer Asaph Hall. Asaph Hall discovered both the Red Planet's moons in 1877. Over 9 kilometers across, Stickney is nearly half the diameter of Phobos itself, so large that the impact that blasted out the crater likely came close to shattering the tiny moon. This stunning, enhanced-color image of Stickney and surroundings was recorded by the HiRISE camera onboard the Mars Reconnaissance Orbiter as it passed within some six thousand kilometers of Phobos in March of 2008. Even...

On Monday, Jupiter took a massive hit from a meteor, which was spotted by amateur astronomers based in the US—and if previous evidence is anything to go by, it could have saved Earth from a massive collision in the process. Dan Peterson of Racine, Wisconsin, was gazing at Jupiter on Monday when he saw a bright, white flash on the surface of the planet. When he posted his observation online, another astrophotographer, George Hall, discovered he'd unknowingly captured the massive explosion on video. Turns out it was probably a meteor striking the surface of the planet—and you can watch the...

September 10, 2012 DNC vs. RNC: Which convention had the most impact? Donald Trump weighs in

Executive Summary ... This report finds that these higher marginal tax rates result in a smaller economy, fewer jobs, less investment, and lower wages. Specifically, this report finds that the higher tax rates will have significant adverse economic effects in the long-run: lowering output, employment, investment, the capital stock, and real after-tax wages when the resulting revenue is used to finance additional government spending. Long-run macroeconomic impact of increasing tax rates on high-income taxpayers in 2013 Through lower after-tax rewards to work, the higher tax rates on wages reduce work effort and labor force participation. The higher tax rates on...

This paper supports the proposal that fragments of an asteroid or comet impacted Earth, deposited silica-and iron-rich microspherules and other proxies across several continents, and triggered the Younger Dryas cooling episode 12,900 years ago.