Climate change will ‘cost world far more than estimated’

Lord Stern says current models do not adequately reflect the science and the impact on global economies  

A A A

Lord Stern, the world’s most authoritative climate economist, has issued a stark warning that the financial damage caused by global warming will be considerably greater than current models predict.

This makes it more important than ever to take urgent and drastic action to curb climate change by reducing carbon emissions, he argues.

Lord Stern, who wrote a hugely influential review on the financial implications of climate change in 2006, says the economic models that have been used to calculate the fiscal fallout from climate change are woefully inadequate and severely underestimate the scale of the threat.

As a result, even the recent and hugely authoritative series of reports from the UN Intergovernmental Panel on Climate Change (IPCC) are significantly flawed, he said.

“It is extremely important to understand the severe limitations of standard economic models, such as those cited in the IPCC report, which have made assumptions that simply do not reflect current knowledge about climate change and its ... impacts on the economy,” said Lord Stern, a professor at the Grantham Institute, a research centre at the London School of Economics.

Professor Stern and his colleague Dr Simon Dietz will today publish the peer-reviewed findings of their research into climate change economic modelling in the The Economic Journal.

Lord Stern says the fiscal fallout that has been calculated is woefully inadequate Lord Stern says the fiscal fallout that has been calculated is woefully inadequate (AFP/Getty)

Their review is highly critical of established economic models which, among other things, fail to acknowledge the full breadth of climate change’s likely impact on the economy and are predicated on assumptions about global warming’s effect on output that are “without scientific foundation”.

Professor Stern, whose earlier research said it is far cheaper to tackle climate change now than in the future, added: “I hope our paper will prompt ... economists to strive for much better models [and] ... help policy-makers and the public recognise the immensity of the potential risks of unmanaged climate change.”

“Models that assume catastrophic damages are not possible fail to take account of the magnitude of the issues and the implications of the science,” he said.

Professor Stern and Dr Dietz say their findings strengthen the case for strong cuts in greenhouse gas emissions and imply that, unless this happens, living standards could even start to decline later this century.

For the study, they modified key features of the “dynamic integrated climate-economy” (Dice) model, initially devised by William Nordhaus in the 1990s. The changes take into account the latest scientific findings and some of the uncertainties about the major risks of climate change that are usually omitted.

The standard Dice model has been used in a wide range of economic studies of the potential impacts of climate change, some of which have been cited in the most recent IPCC report which has been released in three parts over the past nine months.

Dr Dietz said: “While this standard economic model has been useful for economists who estimate the potential impacts of climate change, our paper shows some major improvements are needed before it can reflect the extent of the risks indicated by the science.”

Dr Dietz said his aim was to show how a new version of the model could produce a range of results that are much more representative of the science and economics of climate change, taking into account the uncertainties.

“The new version of this standard economic model, for instance, suggests that the risks from climate change are bigger than portrayed by previous economic models and therefore strengthens the case for strong cuts in emissions of greenhouse gases,” he said.

The new model differs in that it considers a wider temperature range when estimating the impact of doubling the atmospheric concentration of greenhouse gases – a measure of “climate sensitivity”.

Whereas the standard model usually assumes a single temperature for climate sensitivity of about 3C, the new model uses a range of 1.5C to 6C, which the authors say more accurately reflects the scientific consensus.

The standard model also “implausibly” suggests a loss of global output of 50 per cent would only result after a rise in global average temperature of 18C, even though such warming would likely render the Earth uninhabitable for most species, including humans, Dr Dietz contends.

The new model includes the possibility that such damage could occur at much lower levels of global warming. Standard economic models rule out the possibility that global warming of 5-6C above pre-industrial levels could cause catastrophic damages, even though such temperatures have not occurred on Earth for tens of millions of years. Such an assertion, he says, is without scientific foundation and embodies a false assumption that the risks are known, with great confidence, to be small.

The new model also takes into account that climate change can damage not just economic output, but productivity. The standard model assumes that rising levels of greenhouse gases in the atmosphere only affect economic growth in a very limited way, according to Dr Dietz.

Life and Style
tech

Sales of the tablet are set to fall again say analysts

News
A Brazilian wandering spider
news

World's most lethal spider found under a bunch of bananas

News
people
Sport
Mario Balotelli pictured in the win over QPR
footballInternet reacts to miss shocker for Liverpool striker
PROMOTED VIDEO
Have you tried new the Independent Digital Edition apps?
Voices
Sol Campbell near his home in Chelsea
voices
News
i100
News
Kimi the fox cub
newsBurberry under fire from animal rights group - and their star, Kimi
Sport
Fans of Palmeiras looks dejected during the match between Palmeiras and Santos
footballPalmeiras fan killed trying to 'ambush' bus full of opposition supporters
Arts and Entertainment
filmsIt's nearly a wrap on Star Wars: Episode 7, producer reveals
Life and Style
fashion
News
i100
News
<p>Jonathan Ross</p>
<p>Jonathan Ross (or Wossy, as he’s affectionately known) has been on television and radio for an extraordinarily long time, working on a seat in the pantheon of British presenters. Hosting Friday Night with Jonathan Ross for nine years, Ross has been in everything from the video game Fable to Phineas and Ferb. So it’s probably not so surprising that Ross studied at Southampton College of Art (since rebranded Southampton Solent), a university known nowadays for its media production courses.</p>
<p>However, after leaving Solent, Ross studied History at the School of Slavonic and East European Studies, now part of the UCL, a move that was somewhat out of keeping with the rest of his career. Ross was made a fellow of the school in 2006 in recognition of his services to broadcasting.</p>
TV

Rumours that the star wants to move on to pastures new

News
i100
Arts and Entertainment
The cast of Downton Abbey indulge in some racing at a Point to Point
tvNew pictures promise a day at the races and a loved-up Lady Rose
News
people

Comedian says he 'never laughed as hard as I have writing with Rik'

Latest stories from i100
Have you tried new the Independent Digital Edition apps?
iJobs Job Widget
iJobs General

Lead Teacher of Thinking School Drive Team and Year 3 Form teacher

Competitive: Notting Hill Prep School: Spring Term 2015 Innovative, ambitious ...

Operations Data Analyst - London - up to £25,000

£20000 - £25000 per annum + Benefits: Ashdown Group: Operations Data Analyst -...

Programmatic Business Development Manager

£35 - £40000 per annum: Sauce Recruitment: As the Programmatic Business Develo...

Year 5 Teacher

Negotiable: Randstad Education Hull: Randstad Education is currently recruitin...

Day In a Page

Oscar Pistorius sentencing: The athlete's wealth and notoriety have provoked a long overdue debate on South African prisons

'They poured water on, then electrified me...'

If Oscar Pistorius is sent to jail, his experience will not be that of other inmates
James Wharton: The former Guard now fighting discrimination against gay soldiers

The former Guard now fighting discrimination against gay soldiers

Life after the Army has brought new battles for the LGBT activist James Wharton
Ebola in the US: Panic over the virus threatens to infect President Obama's midterms

Panic over Ebola threatens to infect the midterms

Just one person has died, yet November's elections may be affected by what Republicans call 'Obama's Katrina', says Rupert Cornwell
Premier League coaches join the RSC to swap the tricks of their trades

Darling, you were fabulous! But offside...

Premier League coaches are joining the RSC to learn acting skills, and in turn they will teach its actors to play football. Nick Clark finds out why
How to dress with authority: Kirsty Wark and Camila Batmanghelidjh discuss the changing role of fashion in women's workwear

How to dress with authority

Kirsty Wark and Camila Batmanghelidjh discuss the changing role of fashion in women's workwear
New book on Joy Division's Ian Curtis sheds new light on the life of the late singer

New book on Ian Curtis sheds fresh light on the life of the late singer

'Joy Division were making art... Ian was for real' says author Jon Savage
Sean Harris: A rare interview with British acting's secret weapon

Sean Harris: A rare interview with British acting's secret weapon

The Bafta-winner talks Hollywood, being branded a psycho, and how Barbra Streisand is his true inspiration
Tim Minchin, interview: The musician, comedian and world's favourite ginger is on scorching form

Tim Minchin interview

For a no-holds-barred comedian who is scathing about woolly thinking and oppressive religiosity, he is surprisingly gentle in person
Boris Johnson's boozing won't win the puritan vote

Boris's boozing won't win the puritan vote

Many of us Brits still disapprove of conspicuous consumption – it's the way we were raised, says DJ Taylor
Ash frontman Tim Wheeler reveals how he came to terms with his father's dementia

Tim Wheeler: Alzheimer's, memories and my dad

Wheeler's dad suffered from Alzheimer's for three years. When he died, there was only one way the Ash frontman knew how to respond: with a heartfelt solo album
Hugh Bonneville & Peter James: 'Peter loves his classic cars; I've always pootled along fine with a Mini Metro. I think I lack his panache'

How We Met: Hugh Bonneville & Peter James

'Peter loves his classic cars; I've always pootled along fine with a Mini Metro. I think I lack his panache'
Bill Granger recipes: Our chef's heavenly crab dishes don't need hours of preparation

Bill Granger's heavenly crab recipes

Scared off by the strain of shelling a crab? Let a fishmonger do the hard work so you can focus on getting the flavours right
Radamel Falcao: How faith and love drive the Colombian to glory

Radamel Falcao: How faith and love drive the Colombian to glory

After a remarkable conversion from reckless defender to prolific striker, Monaco's ace says he wants to make his loan deal at Old Trafford permanent
Terry Venables: Premier League managers must not be allowed to dictate who plays and who does not play for England

Terry Venables column

Premier League managers must not be allowed to dictate who plays and who does not play for England
The Inside Word: Brendan Rodgers looks to the future while Roy Hodgson is ghost of seasons past

Michael Calvin's Inside Word

Brendan Rodgers looks to the future while Roy Hodgson is ghost of seasons past