IPCC Draft - 95% Certainty Of 2C Rise By 2100; Upper Bound Increase 4.8C
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The draft's scenarios forecast a rise in temperatures of between 0.2 and 4.8 Celsius this century - a narrower band than in 2007. But in almost all of the scenarios, the rise would exceed 2 degrees Celsius.
Governments pledged in 2010 to try to stop global temperatures rising by more than 2 degrees, a threshold seen by scientists as the maximum to avoid more extreme weather, droughts, floods, and other climate change impacts.
Carbon dioxide concentrations in the atmosphere were the highest in 800,000 years, according to the draft report. The draft also said that sea levels were likely to rise by between 29 and 82 centimeters by the end of the century - compared to 18-59 centimeters projected in the 2007 report.
Rising sea levels are a 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, the complete swamping of large areas of land.
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http://www.reuters.com/article/2012/12/14/us-climate-ipcc-idUSBRE8BD0VV20121214
