The other shoe drops. Well, what did anyone really think would happen other than this?
http://www.vox.com/2014/4/22/5551004/two-degrees
By 2009, nearly every government in the world had endorsed the 2°C limit — global warming beyond that level was deemed "dangerous." And so, every year, the world’s leaders meet at UN climate conferences to discuss policies and emissions cuts that they hope will keep us below 2°C. Climate experts churn out endless papers on how we can adapt to 2°C of warming (or less).
Two decades later, there’s just one major problem with this picture. The idea that the world can stay below 2°C looks increasingly delusional.
Consider: the Earth’s average temperature has already risen 0.8°C since the 19th century. And if you look at the current rapid rise in global greenhouse-gas emissions, we’re on pace to blow past the 2°C limit by mid-century — and hit 4°C or more by the end. That’s well above anything once deemed "dangerous." Getting back on track for 2°C would, at this point, entail the sort of drastic emissions cuts usually associated with economic calamities, like the collapse of the Soviet Union or the 2008 financial crisis. And we’d have to repeat those cuts for decades.
The climate community has been slow to concede defeat. Back in 2007, the UN's Intergovernmental Panel on Climate Change published a report noting that the world could stay below 2°C — but only if we started cutting emissions immediately. The years passed, countries did little, and emissions kept rising. So, just this month, the IPCC put out a new report saying, OK, not great, but we can still stay under 2°C. We just need to act more drastically and figure out some way to pull carbon dioxide back out of the atmosphere. (Never mind that we still don’t have the technology to do the latter.)
http://www.vox.com/2014/4/22/5551004/two-degrees