The BBC in the West is going to name and shame the region's traffic trouble spots.

bristol | the environment | news report Sunday August 31, 2008 14:55 by Media Tart

Gridlock in Golden Hill?

Jams in St George?

Pollution on Park Street?

Arctic ice 'is at tipping point'

The BBC in the West is going to name and shame the region's traffic trouble spots.

From A-roads to motorways we're asking where has gridlock got a grip on you?

It's not just the city centre we (The BBC) are interested in - traffic problems can be just as bad in the suburbs and villages.

Commuting its own share of issues: rat runs, temporary traffic lights, contraflows, all that pollution, all that c02.

What are the effects?

For the first time in recorded history, it is now possible to circum-navigete the North Pole.

http://news.bbc.co.uk/2/hi/science/nature/7585645.stm
Arctic sea ice has shrunk to the second smallest extent since satellite records began, US scientists have revealed.

The National Snow and Ice Data Center (NSIDC) says that the ice-covered area has fallen below its 2005 level, which was the second lowest on record.

Melting has occurred earlier in the year than usual, meaning that the iced area could become even smaller than last September, the lowest recorded.

Researchers say the Arctic is now at a climatic "tipping point".

"We could very well be in that quick slide downwards in terms of passing a tipping point," said Mark Serreze, a senior scientist at the Colorado-based NSIDC.

"It's tipping now. We're seeing it happen now," he told the Associated Press news agency.

Under covered

The area covered by ice on 26 August measured 5.26 million sq km (2.03 million sq miles), just below the 2005 low of 5.32 million sq km (2.05 million sq).

But the 2005 low came in late September; and with the 2008 graph pointing downwards, the NSIDC team believes last year's record could still be broken even though air temperatures, both in the Arctic and globally, have been lower than last year.

Last September, the ice covered just 4.13 million sq km (1.59 million sq miles), the smallest extent seen since satellite imaging began 30 years ago. The 1980 figure was 7.8 million sq km (3 million sq miles).

Most of the cover consists of relatively thin ice that formed within a single winter and melts more easily than ice that accumulated over many years.

Irrespective of whether the 2007 record falls in the next few weeks, the long-term trend is obvious, scientists said; the ice is declining more sharply than even a decade ago, and the Arctic region will progressively turn to open water in summers.

A few years ago, scientists were predicting ice-free Arctic summers by about 2080.

Then computer models started projecting earlier dates, around 2030 to 2050; and some researchers now believe it could happen within five years.

That will bring economic opportunities, including the chance to drill for oil and gas. Burning that oil and gas would increase levels of greenhouse gases in the atmosphere still further.

The absence of summer ice would have impacts locally and globally.

The iconography of polar bears unable to find ice is by now familiar; but other species, including seals, would also face drastic changes to their habitat, as would many Arctic peoples.

Globally, the Arctic melt will reinforce warming because open water absorbs more of the Sun's energy than ice does.

Arctic sea ice now second-lowest on record
http://nsidc.org/arcticseaicenews/

Sea ice extent has fallen below the 2005 minimum, previously the second-lowest extent recorded since the dawn of the satellite era. Will 2008 also break the standing record low, set in 2007? We will know in the next several weeks, when the melt season comes to a close. The bottom line, however, is that the strong negative trend in summertime ice extent characterizing the past decade continues.

Overview of conditions

With several weeks left in the melt season, sea ice extent dipped below the 2005 minimum to stand as the second-lowest in the satellite record. The 2005 minimum, at 5.32 million square kilometers (2.05 million square miles), held the record-low minimum until last year.

Recent ice retreat primarily reflects melt in the Chukchi Sea off the Alaskan coast and the East Siberian Seas off the coast of eastern Russia.

Update 9:15 am MT August 27:

Arctic sea ice extent on August 26 was 5.26 million square kilometers (2.03 million square miles), a decline of 2.06 million square kilometers (795,000 square miles) since the beginning of the month. Extent is now within 430,000 square kilometers (166,000 square miles) of last year's value on the same date and is 1.97 million square kilometers (760,000 square miles) below the 1979 to 2000 average.

Conditions in context

Through the beginning of the melt season in May until early August, daily ice extent for 2008 closely tracked the values for 2005.

In early August of 2005, the decline began to slow; in August of 2008, the decline has remained steadily downward at a brisk pace. The 2005 minimum of 5.32 million square kilometers (2.05 million square miles) occurred on September 21

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