"IPCC: 30 years to climate calamity if we carry on blowing carbon budget."

Guardian: “The world’s leading climate scientists have set out in detail for the first time how much more carbon dioxide humans can pour into the atmosphere without triggering dangerous levels of climate change – and concluded that more than half of that global allowance has been used up.” “If people continue to emit greenhouse gases at current rates, the accumulation of carbon in the atmosphere could mean that within as little as two to three decades the world will face nearly inevitable warming of more than 2C, resulting in rising sea levels, heatwaves, droughts and more extreme weather.”
This calculation of the world’s “carbon budget” was one of the most striking findings of the Intergovernmental Panel on Climate Change (IPCC), the expert panel of global scientists who on Friday produced the most comprehensive assessment yet of our knowledge of climate change at the end of their four-day meeting in Stockholm.
The 2,000-plus page report, written by 209 lead authors, also found it was “unequivocal” that global warming was happening as a result of human actions, and that without “substantial and sustained” reductions in greenhouse gas emissions we will breach the symbolic threshold of 2C of warming, which governments around the world have pledged not to do.
….Thomas Stocker, co-chair of the report working group, said measuring recent years in comparison to 1998, an exceptionally hot year, was misleading and that temperature trends could only be observed over longer periods, of about 30 years.
….But the most controversial finding of the report was its “carbon budget”. Participants told the Guardian this was the last part of the summary to be decided, and the subject of hours of heated discussions in the early hours of Friday morning. Some countries were concerned that including the numbers would have political repercussions.
The scientists found that to hold warming to 2C, total emissions cannot exceed 1,000 gigatons of carbon. Yet by 2011, more than half of that total “allowance” – 531 gigatons – had already been emitted.”