One of the Government's most senior scientific advisors has said that efforts to stop a sharp rise in global temperatures were now unrealistic.
Professor Sir Robert Watson said that the hope of restricting the average temperature rise to 2C was "out the window".
He said that the rise could be as high as 5C - with dire conseqences.
Professor Watson added the Chancellor, George Osborne, should back efforts to cut the UK's CO2 emissions.
He said: "I have to look back (on the outcome of sucessive climate change summits) Copenhagen, Cancun and Durban and say that I can't be overly optimistic.
"To be quite candid the idea of a 2C target is largely out of the window".
Continue reading the main story?Start Quote
End Quote Professor Sir Bob Watson Chief Scientist, DefraI would say to George Osborne, 'work with the public sector. Work with the public on behavior change. Let's demonstrate to the rest of the world that we can make significant progress here?
Professor Watson is among the most respected scientists in the world on climate change policy.
He is currently Chief Scientist at the Department for Food and Rural Affairs and a former Chair of the Intergovernmental Panel on Climate Change.
He also used to work for the World Bank and was a senior advisor to former Vice President Al Gore at the White House.
Professor Watson, who is due to step down from his role at Defra next month, suggested that the Chancellor, George Osborne reconsider his opposition to tough measures to reduce carbon dioxide emissions.
Mr Osborne has said that the UK's ambitious targets for CO2 should be relaxed so as not to drive businesses to countries which have set themselves much lower targets.
"I would say to George Osborne: 'work with the public sector. Work with the public on behavior change. Let's demonstrate to the rest of the world that we can make significant progress here'."
Professor Watson argues that the UK and with Germany should continue to take the lead in driving efforts to reach an effective international treaty.
Hurt Poorest
"If we carry on the way we are there is a 50-50 chance that we will get to a 3 degree rise," he said.
"I wouldn't rule out a 5 degree world and that would be quite serious for the people of the world especially the poorest. We need more political will than we currently have".
The IPCC 2007 assessment summarised the probable impact of various temperature rise sceanrios.
It shows that the impact on human health, the availability of food and water, the loss of coastlines becomes progressively worse as the average temperature of the planet rises.
The 2C target was agreed at the United Nations Framework Convention on Climate Change meeting in 2010.
The majority of countries though prefer a lower target of 1.5C.
A number of analyses have also concluded that the 2C would be missed. The most recent was by the International Energy Agency earlier this year.
Professor Watson added that deep cuts in CO2 emissions are possible using innovative technologies without harming economic recovery.
"This doesn't take a revolution in energy technology an evolution would get us there.
"So the question 'is is there the political will and everyone (ends up) looking at each other".
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Source: http://www.bbc.co.uk/news/science-environment-19348194#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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