Web Earth Online Forum Index Web Earth Online
User discussion and support forum for Web Earth Online, Home Page
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   RegisterRegister   ProfileProfile Log inLog in 

Environmental News

 
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    Web Earth Online Forum Index -> Critter Cam and Animal News
View previous topic :: View next topic  
Author Message
webearthonline



Joined: 03 Feb 2007
Posts: 1589

PostPosted: Fri Sep 04, 2009 6:10 am    Post subject: Environmental News Reply with quote

The latest environmental news -


Arctic reverses trend, is warmest in two millennia

This undated handout photo provided by Northern Arizona University shows AP This undated handout photo provided by Northern Arizona University shows sediment collected at Sunday
By RANDOLPH E. SCHMID, AP Science Writer Randolph E. Schmid, Ap Science Writer Thu Sep 3, 3:35 pm ET

WASHINGTON The Arctic is warmer than it's been in 2,000 years, even though it should be cooling because of changes in the Earth's orbit that cause the region to get less direct sunlight. Indeed, the Arctic had been cooling for nearly two millennia before reversing course in the last century and starting to warm as human activities added greenhouse gases to the atmosphere.

"If it hadn't been for the increase in human-produced greenhouse gases, summer temperatures in the Arctic should have cooled gradually over the last century," said Bette Otto-Bliesner, a National Center for Atmospheric Research scientist and co-author of a study of Arctic temperatures published in Friday's edition of the journal Science.

The most recent 10-year interval, 1999-2008, was the warmest of the last 2,000 years in the Arctic, according to the researchers led by Darrell S. Kaufman, a professor of geology and environmental science at Northern Arizona University.

Summer temperatures in the Arctic averaged 2.5 degrees Fahrenheit (1.4 degrees Celsius) warmer than would have been expected if the cooling had continued, the researchers said.

The finding adds fuel to the debate over a House-passed climate bill now pending in the Senate. The administration-backed measure would impose the first limits on greenhouse gases and eventually would lead to an 80 percent reduction by putting a price on each ton of climate-altering pollution.

It is the latest in a drumbeat of reports on warming conditions in the Arctic, including:

A marine scientist reports that Alaskan waters are turning acidic from absorbing greenhouse gases faster than tropical waters, potentially endangering the state's $4.6 billion fishing industry.

NASA satellite measurements show that sea ice in the Arctic is more than just shrinking in area, it is dramatically thinning. The volume of older crucial sea ice in the Arctic has shrunk by 57 percent from the winter of 2004 to 2008.

Global warming effects in Alaska also include shrinking glaciers, coastal erosion and the march north of destructive forest beetles formerly held in check by cold winters.

And with the melting of land-based ice, such as the massive Greenland ice cap, sea levels could rise across the world, threatening millions who live in coastal cities.

The new report is based on a decade-by-decade reconstruction of temperatures over the past 2,000 years developed using information from ancient lake sediments, ice cores, tree rings and other samples. The findings were then compared with complex computer climate model simulations created at the National Center for Atmospheric Research in Boulder, Colo.

"This study provides us with a long-term record that reveals how greenhouse gases from human activities are overwhelming the Arctic's natural climate system," commented NCAR scientist David Schneider, a co-author on the study.

Added Jonathan T. Overpeck, a University of Arizona professor of geosciences: "The Arctic should be very sensitive to human-caused climate change, and our results suggest that indeed it is."

In addition, he pointed out, as the Arctic warms there is less snow and ice to reflect solar energy back into space and the newly exposed dark soil and dark ocean surfaces absorb solar energy and warm further, accelerating the warming process.

The Arctic cooling had been the result of a 21,000-year cycle in the Earth's movement that caused the far north to get progressively less summertime energy from the sun for the last 8,000 years. That process won't reverse for another several thousand years.

The research was funded by the National Science Foundation.

_________________
weo
Back to top
View user's profile Send private message Visit poster's website
Vargen Saphia



Joined: 31 Jan 2009
Posts: 2567
Location: Sweden

PostPosted: Fri Sep 04, 2009 7:00 am    Post subject: Reply with quote

It's not only bad here in the North, but also around the Ecuator ( the middle between Antartica and Artica ) , in about 30 years or so, the temprature there could easily kill humans that are not born there.
_________________
Back to top
View user's profile Send private message
Display posts from previous:   
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    Web Earth Online Forum Index -> Critter Cam and Animal News All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group

This system provided by Web Earth Online © 2007 TSD Inc.