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#410004 - 09/22/07 02:18 AM Most Polar Bears Gone By 2050, Studies Say
Locksley
16 Point


Registered: 10/23/01
Posts: 19734
Loc: Antioch TN

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John Roach
for National Geographic News

September 10, 2007
Two-thirds of the world's polar bears could disappear by 2050 as global warming continues to melt the Arctic's sea ice, according to a series of U.S. government studies released last Friday.

The new findings paint a sobering picture for polar bears, whose dependence on sea ice makes them particularly vulnerable to warming temperatures.

"Our results have demonstrated that as the sea ice goes, so goes the polar bear," said Steven Amstrup, a U.S. Geological Survey (USGS) wildlife research biologist in Anchorage, Alaska, and leader of the polar bear studies.

USGS conducted the studies to help the U.S. Fish and Wildlife Service determine whether polar bears warrant protection under the U.S. Endangered Species Act. That decision is due in January 2008.

(Read: "Polar Bears Proposed for U.S. Endangered Species List" [December 27, 2006].)

Kassie Siegel is a climate change activist with the Center for Biological Diversity in Joshua Tree, California. The new studies, she said, represent a watershed moment in the climate crisis.

"If we don't change the path that we're on now, then it will be too late," she said. "Polar bears will become extinct."

Polar Bears and Sea Ice

Scientists estimate that 20,000 to 25,000 polar bears live throughout the Northern Hemisphere in areas that are covered by sea ice for extensive periods.

Polar bears eat mostly seals and other fatty marine mammals that they hunt from the ice.

In some places—like the southern end of polar bear range in Canada's Hudson Bay—the sea ice melts in the summer. The bears then come onto land, where they have insufficient food until the sea ice refreezes in the fall.

Those bears, USGS's Amstrup said, may be the first to die off. As the sea ice melts sooner each summer, the bears will be forced to come ashore earlier and face food shortages before they have stored enough fat to last through the season.

"There's a limit to how long they can fast," Amstrup said.

In other regions polar bears live on the sea ice year-round.

These bears prefer to hunt from the ice that hangs over shallow continental shelf waters, which contain more prey than deeper waters offshore.

But as the ice retreats farther from the shoreline, the bears may have less success with their hunts (related: "Arctic Ice at All-Time Low" [August 20, 2007]).

In addition, the rapid movement of sea ice in these regions may leave some bears stranded in food-poor areas, or it might require long and exhausting swims from food-rich areas back to ice, Amstrup noted.

By mid-century polar bears will likely be eliminated from the southern end of their range and in the Polar Basin, where sea ice is moving farther from land.

These two areas are currently home to approximately two-thirds of the world's polar bear population, Amstrup said.

Polar bears are only predicted to hang on in the Canadian Arctic islands and some regions along the northern coast of Greenland where sea ice is expected to persist even in summer (see map).

Survival Hopes

The USGS findings are based on the best available models of future climate, Amstrup said.

Warming temperatures, however, are melting the sea ice quicker than even the best climate models projected, according to the National Snow and Ice Data Center in Boulder, Colorado.

As of September 3, 2007, sea-ice extent had fallen to 1.70 million square miles (4.42 million square kilometers)—beating the previous record low of 2.05 million square miles (5.32 million square kilometers) set on September 21, 2005.

The United Nations Intergovernmental Panel on Climate Change earlier this year determined that the ice-melting trend is "very likely" being caused by human emissions of greenhouse gases, Amstrup noted.

So hopes of long-term polar bear survival hinges on humans taking action now, he said.

Atmospheric scientists believe that gases already in the climate system will continue to warm the Earth and melt sea ice until about 2050, even if cuts to emissions are made today.

But if polar bears do persist through the end of the century in the Canadian Arctic islands, those bears could seed a rebounding population.

"Emissions reductions now could assure polar bears will still be around to repopulate sea ice when it returns to other areas," Amstrup said in a followup email.

http://news.nationalgeographic.com/news/2007/09/070910-polar-bears.html
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#410468 - 09/22/07 05:23 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Locksley]
Locksley
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Registered: 10/23/01
Posts: 19734
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OK BSK and TWRA guys what great danger is it in putting a few Polar Bears at the South Pole now so they will be around to hunt in the future???
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To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus

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#412218 - 09/24/07 04:10 AM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Locksley]
Anonymous TnDeer Old Timer
Unregistered



nothing but If you think this administration would spend 50 cents on wildlife or anything to do with it then think again. That would mean they would acknowledge global warming and they say theres no such thing. The bush administration is a freaking pathetic manipulative joke from helllllllllll
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#414066 - 09/24/07 10:32 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: ]
Doskil
6 Point


Registered: 09/23/07
Posts: 747
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The how come there are more polar bears than before in Manitoba?
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#416177 - 09/25/07 11:02 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Doskil]
Locksley
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Registered: 10/23/01
Posts: 19734
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 Originally Posted By: Doskil
The how come there are more polar bears than before in Manitoba?


I guess they are fourced to shore by retreating shore ice pack.
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To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus

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#423120 - 09/30/07 11:38 AM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Locksley]
new2deer
Spike


Registered: 07/02/06
Posts: 48
Loc: middle TN

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Global warming is not man made.I remember in high school we were all going to freeze to death now its burn to death.It will cycle again.
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#430069 - 10/04/07 09:34 AM Re: Most Polar Bears Gone By 2050, Studies Say [Re: new2deer]
Locksley
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Registered: 10/23/01
Posts: 19734
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 Originally Posted By: new2deer
Global warming is not man made.I remember in high school we were all going to freeze to death now its burn to death.It will cycle again.

It doesn't matter what is causing it .
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To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus

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#435246 - 10/07/07 09:04 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Locksley]
trealtree
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Registered: 09/29/04
Posts: 10817
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The world goes through natural climate changes. It is caused by forces we have no control over.
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#440798 - 10/10/07 07:16 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: trealtree]
Locksley
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Registered: 10/23/01
Posts: 19734
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It doesn't matter what is causing it . OK BSK and TWRA guys what great danger is it in putting a few Polar Bears at the South Pole now so they will be around to hunt in the future??? Two-thirds of the world's polar bears could disappear by 2050 as global warming continues to melt the Arctic's sea ice, according to a series of U.S. government studies released last Friday.

Edited by Locksley (10/10/07 07:17 PM)
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To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus

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#441455 - 10/10/07 11:04 PM Re: Most Polar Bears Gone By 2050, Studies Say [Re: Locksley]
Locksley
16 Point


Registered: 10/23/01
Posts: 19734
Loc: Antioch TN

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Locksley
12 Point


Registered: 10-23-2001
Posts: 7287
Loc: Antioch TN


It doesn't matter what is causing it . OK BSK and TWRA guys what great danger is it in putting a few Polar Bears at the South Pole now so they will be around to hunt in the future??? Two-thirds of the world's polar bears could disappear by 2050 as global warming continues to melt the Arctic's sea ice, according to a series of U.S. government studies released last Friday. http://www.tndeer.com/tndeertalk/ubbthreads.php?ubb=showflat&Number=440798&page=0#Post440798

Edited by Locksley (Today at 07:25 PM)
_________________________
To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus




#440920 - Today at 08:04 PM Re: world's polar bears could disappear by 2050 [Re: Locksley]
FLIPPER FLIPPER
6 Point


Registered: 09-07-2002
Posts: 828
Loc: NIOTA, TN


I was planning to go in 2010...guess I had better bump it up a couple of years, before the nut jobs put them on the endangered list! I really need one of those standing in my den.
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#440953 - Today at 08:17 PM Re: world's polar bears could disappear by 2050 [Re: FLIPPER]
BSK BSK
Jerkasourous of the non-typical kind
Non-Typical


Registered: 03-11-1999
Posts: 33344
Loc: Nashville, TN


And this is in the QDM section why?
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#440978 - Today at 08:26 PM Re: world's polar bears could disappear by 2050 [Re: BSK]
Locksley Locksley
12 Point


Registered: 10-23-2001
Posts: 7287
Loc: Antioch TN

Online
cause no one sees it in the other section follow the link . Where are all the TWRA bear experts at .
http://www.tndeer.com/tndeertalk/ubbthreads.php?ubb=showflat&Number=440798&page=0#Post440798
_________________________
To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus
_________________________
To know wisdom and instruction; to perceive the words of understanding;"The greatest pain a man can suffer is to have knowledge of much, and power over nothing" - Herodotus

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