3ºC

Leaked UN report shows cuts offered at Copenhagen would lead to 3C rise

UN secretariat initial draft shows gap of up to 4.2 gigatonnes of CO2 between present pledges and cuts required to limit rise to 2C

A confidential UN analysis obtained by the Guardian reveals that the emissions cuts offered so far at the Copenhagen climate change summit will lead to global temperatures rising by an average of 3C.

The analysis seriously undermines the statements by governments that they are aiming to limit emissions to a level ensuring no more than a 2C temperature rise over the next century, and indicates that the last 24 hours of negotiations will be extremely challenging.

A rise of 3C would mean up to 170 million more people suffering severe coastal floods and 550 million more at risk of hunger, according to the 2006 Stern economic review of climate change for the UK government - as well as leaving up to 50% of species facing extinction. Even a rise of 2C would lead to sharp decline in tropical crop yields, more flooding and droughts.

Greenpeace campaigner Joss Garman said: "This is an explosive document that shows the numbers on the table at the moment would lead to nothing less than climate breakdown and an extraordinarily dangerous situation for humanity. The UN is admitting in private that the pledges made by world leaders would lead to a 3C rise in temperatures. The science shows that could lead to the collapse of the Amazon rainforest, crippling water shortages across South America and Australia and the near-extinction of tropical coral reefs, and that's just the start of it."

BREAKING: Leaked UN Climate Text Confirms What We've Been Saying (AKA The Real ClimateGate)

A leaked copy of an official UN assessment just emerged from the talks--it says quite clearly that the proposals now on the table will yield temperature increases of at least 3 degrees Celsius. This is what the Climate Interactive folks have been saying all along, news that's been reflected on the front of our website. But now the UN is saying it, and they're adding--in one of the classic examples of bureaucratic understatement of all time, that the estimated temperature rise of 3 degrees “will reduce significantly the probability to stay within a temperature increase of 2 degrees Celsius.”  You think?

Heat Over a Leaked U.N. Warming Analysis

The analysis concluded that without much stronger action to cut emissions both before and after 2020, “global emissions will remain on an unsustainable pathway that could lead to concentrations equal or above 550 p.p.m. [parts per million of carbon dioxide in the air] with the related temperature” rising 3 degrees Celsius, or 5.4 degrees Fahrenheit. That is far above the thresholds for dangerous warming being debated at the meeting and accepted in recent statements by the major economies of the world.