Evidence for man-made climate change getting stronger - U.N.

DOHA Thu Nov 29, 2012 5:04pm IST

Smoke billows from chimneys at a chemical factory in Tianjin Municipality December 23, 2008. REUTERS/Stringer/Files

Smoke billows from chimneys at a chemical factory in Tianjin Municipality December 23, 2008.

Credit: Reuters/Stringer/Files

Related Topics

DOHA (Reuters) - Evidence that global warming is man-made is getting stronger, the head of a U.N. panel of climate scientists said, in a further blow to sceptics who argue rising temperatures can be explained by natural variations.

Rajendra Pachauri spoke on the sidelines of a conference in Qatar where 200 nations are trying to reach a deal to cut emissions of greenhouse gases to avert floods, droughts, heatwaves and mounting sea levels.

The influential U.N. climate panel said the probability human activity was the main cause of climate change was "at least 90 percent" in its last report in 2007.

Pachauri told Reuters late on Wednesday he expected the panel would raise the level of that likelihood even higher in its next report, due in 2013.

"We certainly have a substantial amount of information available by which I hope we can narrow the gaps, increase the level of certainty of our findings," he said.

"We will have a lot more information this time around on the melting of Greenland and Antarctica. I hope we will get a little more information on sea level rise," he added.

Rising sea levels pose a particular threat to people living in low-lying areas, from Bangladesh to the cities of New York, London and Buenos Aires. They open up the risk of storm surges, coastal erosion and, in the worst case scenario, complete swamping of large areas of land.

The last report by the U.N.'s Intergovernmental Panel on Climate Change (IPCC) gave a wide range for sea levels, saying they could rise by between 18 and 59 cm (7-24 inches) by 2100.

Those numbers did not take account of a possible acceleration of a melt of Antarctic or Greenland ice, due to big uncertainties.


Some scientists and organisations have questioned whether gases released by industry and other human activity are the main causes of global warming, pointing instead to natural climactic variations and events like shifts in the sun's output.

They have also suggested warming may have flattened out, citing data showing 1998, 2005 and 2010 are tied as the warmest years since records began in the mid-19th century.

But a study released during the Qatar talks study backed IPCC projections that temperatures were creeping higher, and sea levels were rising even faster than predicted.

Pachauri said the panel would also gain wider understanding of the formation of clouds. The white tops of clouds at low altitudes tend to bounce heat back into space, cooling the planet, while high-altitude clouds often trap heat.

The Doha talks are struggling to extend the U.N.'s troubled Kyoto Protocol, which binds most developed nations to cut emissions by at least 5.2 percent below 1990 levels by 2008-12.

Russia, Canada and Japan are pulling out, saying it is now time for fast-growing emerging nations led by China and India to take on commitments. Under current plans, a new global deal is meant to be agreed in 2015 and enter into force by 2020.

Pachauri said that Kyoto still seemed a good idea. "It's the only show in town. Why give it up?" he said.

A U.N. conference two years ago agreed to limit any rise in temperatures to less than 2 degrees Celsius (3.6F) above pre-industrial times. But greenhouse gas levels hit a new record in 2011, despite the world economic slowdown.

(Reporting By Alister Doyle; Editing by Andrew Heavens)

We welcome comments that advance the story through relevant opinion, anecdotes, links and data. If you see a comment that you believe is irrelevant or inappropriate, you can flag it to our editors by using the report abuse links. Views expressed in the comments do not represent those of Reuters. For more information on our comment policy, see http://blogs.reuters.com/fulldisclosure/2010/09/27/toward-a-more-thoughtful-conversation-on-stories/
Comments (1)
crmurthi wrote:
Pachouri Is basing his predictions on the controversial report of the IPCC panel of scientists. The data callected by them and their analysis have been questioned by many freelance researchers of repute. Cetailed observations over the years have shown that the Arctic loss of ice cover largely contributes to the climate change since it is many times more than the human factor. Further as per simple rules of physics floating ice bergs even of continental sizes cannot increase the sea levels except marginally. Also it is already being debated as to why the ice cover is increasing in the Antartic? The arctic and antarctic phenomena could be the cause for the unexpected storms, quakes, floods and droughts. Human causes are so insignificant that we should concentrate more on disaster management than pollution control measures being proposed in the conference.

Nov 29, 2012 7:50pm IST  --  Report as abuse
This discussion is now closed. We welcome comments on our articles for a limited period after their publication.

  • Most Popular
  • Most Shared

India-China Ties


LIC on Markets

LIC on Markets

LIC chairman bullish on Indian markets  Full Article 



Infosys partners with China's Huawei for cloud-based services  Full Article 

Gold Outlook

Gold Outlook

Gold imports seen up, premiums likely to double on festive buying  Full Article 

Trade Dispute

Trade Dispute

U.S. to press India on trade row during Modi's Washington visit  Full Article 

Fed Policy Meet

Fed Policy Meet

Fed renews zero rate pledge, but hints at steeper rate hike path  Full Article 

Reuters India Mobile

Reuters India Mobile

Get the latest news on the go. Visit Reuters India on your mobile device.  Full Coverage