Melting of Greenland's ice sheet 'is the turning point'

By Michael McCarthy,
Environment Editor
Published: 30 October 2006

//news.independent.co.uk/environment/article1940797.ece

The world's target for stopping global warming should be based on the point at which the melting of the great Greenland ice sheet becomes irreversible, says the Government's chief scientific adviser, Sir David King.

The loss of Greenland's ice would be a global catastrophe, raising sea levels by more than 20ft, swamping vast regions of low-lying land from East Anglia to Bangladesh.

The international community must limit the atmospheric level of the principal greenhouse gas, carbon dioxide (C02), to below the point where the Greenland ice begins to melt in a runaway manner, Sir David said. This figure is not yet precisely known - but much scientific effort is being expended on finding it out.

Sir David is one of the world's most influential voices on climate change and his suggestion may provide a basis for eventual agreement on one of climate change's thorniest questions: exactly where must the rise in atmospheric C02 - which has gone from 315 parts per million in 1958 to
382ppm today - be halted?

The world community now agrees that the waste gas from motor vehicles and power stations is causing the atmosphere to warm rapidly. But it cannot agree on a precise figure which should be the absolute limit allowable to prevent global disaster.

Some commentators have suggested the C02 level must be halted at 400ppm - but that is now likely to be reached within 10 years and seems impossible to achieve in practice. Sir David has previously suggested 550ppm as "realistic" - but drew criticism for not being more ambitious.

His new suggestion, however, takes a different approach, pinpointing an undeniable disaster level and making that the target - whatever it turns out to be.

Greenland's "tipping point" is not yet known in terms of atmospheric C02 levels, although in terms of temperature it is assumed to be somewhere beyond a global rise of 3C above the level pertaining before the industrial revolution. (Global temperatures currently stand at about 0.7C above pre-industrial, and are steadily climbing). Scientists are seeking it with supercomputer mathematical models of the climate and of the ice mass.

The world's target for stopping global warming should be based on the point at which the melting of the great Greenland ice sheet becomes irreversible, says the Government's chief scientific adviser, Sir David King.

The loss of Greenland's ice would be a global catastrophe, raising sea levels by more than 20ft, swamping vast regions of low-lying land from East Anglia to Bangladesh.

The international community must limit the atmospheric level of the principal greenhouse gas, carbon dioxide (C02), to below the point where the Greenland ice begins to melt in a runaway manner, Sir David said. This figure is not yet precisely known - but much scientific effort is being expended on finding it out.

Sir David is one of the world's most influential voices on climate change and his suggestion may provide a basis for eventual agreement on one of climate change's thorniest questions: exactly where must the rise in atmospheric C02 - which has gone from 315 parts per million in 1958 to
382ppm today - be halted?

The world community now agrees that the waste gas from motor vehicles and power stations is causing the atmosphere to warm rapidly. But it cannot agree on a precise figure which should be the absolute limit allowable to prevent global disaster.

Some commentators have suggested the C02 level must be halted at 400ppm - but that is now likely to be reached within 10 years and seems impossible to achieve in practice. Sir David has previously suggested 550ppm as "realistic" - but drew criticism for not being more ambitious.

His new suggestion, however, takes a different approach, pinpointing an undeniable disaster level and making that the target - whatever it turns out to be.

Greenland's "tipping point" is not yet known in terms of atmospheric C02 levels, although in terms of temperature it is assumed to be somewhere beyond a global rise of 3C above the level pertaining before the industrial revolution. (Global temperatures currently stand at about 0.7C above pre-industrial, and are steadily climbing). Scientists are seeking it with supercomputer mathematical models of the climate and of the ice mass.


Informant: binstock

World-News

Independent Media Source

User Status

Du bist nicht angemeldet.

Suche

 

Aktuelle Beiträge

Trump and His Allies...
https://www.commondreams.o rg/views/2022/06/21/trump- and-his-allies-are-clear-a nd-present-danger-american -democracy?utm_source=dail y_newsletter&utm_medium=Em ail&utm_campaign=daily_new sletter_op
rudkla - 22. Jun, 05:09
The Republican Party...
https://truthout.org/artic les/the-republican-party-i s-still-doing-donald-trump s-bidding/?eType=EmailBlas tContent&eId=804d4873-50dd -4c1b-82a5-f465ac3742ce
rudkla - 26. Apr, 05:36
January 6 Committee Says...
https://truthout.org/artic les/jan-6-committee-says-t rump-engaged-in-criminal-c onspiracy-to-undo-election /?eType=EmailBlastContent& eId=552e5725-9297-4a7c-a21 4-53c8c51615a3
rudkla - 4. Mär, 05:38
Georgia Republicans Are...
https://www.commondreams.o rg/views/2022/02/14/georgi a-republicans-are-delibera tely-attacking-voting-righ ts
rudkla - 15. Feb, 05:03
Now Every Day Is January...
https://www.commondreams.o rg/views/2022/02/07/now-ev ery-day-january-6-trump-ta rgets-vote-counters
rudkla - 8. Feb, 05:41

Archiv

Oktober 2006
Mo
Di
Mi
Do
Fr
Sa
So
 
 
 
 
 
 
 
 
 
 
 
 

Status

Online seit 6295 Tagen
Zuletzt aktualisiert: 22. Jun, 05:09

Credits


Afghanistan
Animal Protection - Tierschutz
AUFBRUCH für Bürgerrechte, Freiheit und Gesundheit
Big Brother - NWO
Brasilien-Brasil
Britain
Canada
Care2 Connect
Chemtrails
Civil Rights - Buergerrechte - Politik
Cuts in Social Welfare - Sozialabbau
Cybermobbing
Datenschutzerklärung
Death Penalty - Todesstrafe
Depleted Uranium Poisoning (D.U.)
Disclaimer - Haftungsausschluss
... weitere
Profil
Abmelden
Weblog abonnieren