Sunday, September 29, 2013

New York Times Op-Ed: It Was a Mistake to Believe the Hockey Stick
As for the recent plateau, I predicted it, back in 2004. Well, not exactly. In an essay published online then at MIT Technology Review, I worried that the famous “hockey stick” graph plotted by three American climatologists in the late 1990s portrayed the global warming curve with too much certainty and inappropriate simplicity. The graph shows a long, relatively unwavering line of temperatures across the last millennium (the stick), followed by a sharp, upward turn of warming over the last century (the blade). The upward turn implied that greenhouse gases had become so dominant that future temperatures would rise well above their variability and closely track carbon dioxide levels in the atmosphere....

Now They Tell Us: New York Times Editorial Announces It Was A Mistake to Take the Mann Hockey Stick "Seriously"
...“Suppose... future measurements in the years 2005-2015 show a clear and distinct global cooling trend. (It could happen.) If we mistakenly took the hockey stick seriously — that is, if we believed that natural fluctuations in climate are small — then we might conclude (mistakenly) that the cooling could not be just a random fluctuation on top of a long-term warming trend, since according to the hockey stick, such fluctuations are negligible. And that might lead in turn to the mistaken conclusion that global warming predictions are a lot of hooey. If, on the other hand, we reject the hockey stick, and recognize that natural fluctuations can be large, then we will not be misled by a few years of random cooling.”...

...O.K., I didn’t actually predict a pause in the warming but a possible period of cooling. But that’s close enough....

Climate change is on ice: UN scientists reveal the world's barely got any hotter in the last 15 years - but say they are now 95% certain man is to blame for global warming
UN scientists said today they are '95 per cent' certain that climate change is man made, but still could not explain why the world has barely got any hotter in the last 15 years.

The United Nations’ Intergovernmental Panel on Climate Change (IPCC) said that sea levels have risen by 19cm since 1901 and are expected to rise a further 26-82cm by the end of the century.

It added that concentrations of CO2 and other greenhouse gases in the atmosphere have increased to levels that are unprecedented in at least 800,000 years.

But the landmark report conceded that world temperatures have barely risen in the past 15 years, despite growing amounts of greenhouse gases being pumped into the atmosphere....