LONDON - The world will have to bet on extreme measures to
avoid serious global warming, the International Energy Agency said on
Wednesday, adding to growing worries that governments have
under-estimated the problem.
The world will have to suck greenhouse gases out of the atmosphere
because it was too late to rely on gradual curbs in heat-trapping
greenhouse gas emissions, it said.
The energy adviser to 28 rich countries detailed two paths for
limiting warming to 2 and 3 degrees Celsius respectively, which would
both require huge annual investments to deploy fossil fuels
"Both scenarios imply that net greenhouse gas emissions turn
negative -- carbon absorption exceeds gross emissions -- towards the
end of the century," said the IEA's set-piece annual energy report,
published on Wednesday.
That could involve the deployment of an untested technique to pump
underground carbon dioxide produced from burning vegetation, using
carbon capture and storage, and by planting more forests, the report
If the world carried on as normal without taking new steps to fight
climate change temperature would rise in the long-term by up to 6
Above 2 degrees warming, "hundreds of millions of people would face
reduced water supplies," and above 3 degrees food production worldwide
would be "very likely to decrease," a U.N. panel of climate scientists
said last year.
Limiting warming to no more than 2 degrees would be especially
expensive because it would involve scrapping and replacing dirty power
plants at a cost of about $3.6 trillion from 2010-2030, the IEA report
That compares with global efforts in recent weeks to shore up the world economy at a cost of about $4 trillion.
A view that more than 2 degrees of global warming is inevitable has gained ground.
Greenhouse gases are already at high enough concentrations in the
air to stoke that amount of warming -- except that smoke and other
pollution are blocking out the sun's rays, said Hans Joachim
Schellnhuber, director of the Potsdam Institute for Climate Impact
"This is masking two thirds of the global warming. We already have
2.4 degrees of warming in the system," he told Reuters on Tuesday.
On the positive side -- regarding the cost of the climate fight --
limiting greenhouse gas emissions from burning fossil fuels will also
cut costly oil consumption.
Partly as a result of recent oil price rises, global spending on oil
had quadrupled to 4 percent of global economic output (GDP) in 2007
compared to 1 percent in 1998, and that would rise to 5 percent, the
"The only time the world has ever spent so much of its income on oil was in the early 1980s," the IEA said.
Another cost saving from the climate fight will be the avoided
damage from droughts, floods and sea level rise, which British
economist Nicholas Stern famously said could be 20 times the cost of
curbing greenhouse gases.
"We start in a difficult place," Stern told Reuters on Tuesday. "The
(pollution) in the atmosphere, give us time to bring that (CO2 in the
atmosphere) back down to the kind of levels ... that are consistent
with a 50/50 chance of holding the overall temperature increase to 2
Additional reporting by Pete Harrison in Brussels; editing by James Jukwey