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Published: Thursday 18 July, 2013

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The Intergovernmental Panel on Climate Change said that evidence was now unequivocal from direct observations of global average air and sea temperatures, the widespread melting of snow and ice and rising sea levels.

The scientists said ther fashion bag outlet e is a more than 90 per cent probability that the rise in temperatures is manmade.

The IPCC report estimates that continued emissions of the greenhouse gases carbon dioxide, methane and nitrous oxides will lead to an increase in global average temperatures of between 1.8C and 4C by 2100 with the most likely figure around 3C.

The full range of possible temperature rise increased by half a degree since the IPCCs report of 2001. Possible average temperature increases by the end of the century is now between 2.4C and 6.4C.

Susan Solomon, the American chairman of IPCC working group 1, the scientists who produced the summary, said there was very high confidence that the net effect of human activity since 1750 has been one of warming.

That was not being cancelled out by the Earths natural processes.

The warming seen over the past half century was unusual and unlike anything for 1,300 years. The last time the polar fashion bag outlet regions were significantly warmer was 125,000 years ago, when sea levels were almost 23ft higher. Dr Solomon said there had been exciting developments since 2001: evidence of a change in Arctic and seaice temperatures, ocean salinity, droughts and tropical cyclones.

The reports longawaited and much argued over killer phrase or attribution statement bolstered confidence in the predictions since 2001.

It said: Most of the observed increase in globally averaged temperatures since the mid20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations.

Scientists say there has probably been discernible warming on all six continents. Only the lack of a temperature record from Antarctica before 1950 made it uncertain.

In the next 20 years, a warming of 0.2C a decade was expected. Even if greenhouse gas emissions were stabilised today there would be a warming of 0.1C because of concentrations in the atmosphere.

Dr Solomon said: Continued greenhouse gas emissions at above present rates will lead to bigger changes than we saw in the last century.

She stressed that the IPCCs predictions did not include positive feedbacks, such as the speeding up of global warming caused by the dying of the rainforests.

Landbased ice in Greenland could be expected to begin melting between 1.9C and 4.6C. If that continued for millennia, that would lead to the virtual elimination of the Greenland ice sheet, with a resulting sea level rise of about 23ft.

The prediction, made in the IPCCs Fourth Assessment Report, is remarkably similar to the 3C rise it predicted in its first report in 1990. It is the confidence of the predictions and the involvement of 2,500 of the worlds climate scientists, some of them sceptics, that has changed.

Since 1990, while politicians have argued about what should be done, the blanket of greenhouse gases that keeps the planet above the temperatures of space has increased by seven per cent, says the report.

The radiative forcing potential the amount the blanket can warm the planet has increased 30 per cent.

Achim Steiner, the director general of the UN Environment Programme, said the report was a critical milestone.

February 2, 2007 may be remembered as the day the question mark was removed from whether people are to blame for climate change.

President Jacques Chirac said: We are on the historical doorstep of the irreversible.

The Kyoto Protocol is the main plan for capping emissions of greenhouse gases but it has been critically weakened since the U fashion bag outlet nited States, the leading source of the gases, pulled out in 2001. Emissions by many backers of Kyoto are far over target.

In December, talks on a successor to Kyoto, will begin in Bali. Tony Blair and Angela Merkel, the German chancellor, hope a deal to bring the US, India and China into an emission treaty can be done at the G8 summit in June. fashion bag outlet