World's top climate scientists confess:

Global warming is just QUARTER what we thought - and computers got the effects of greenhouse gases wrong

By David Rose

A leaked copy of the world’s most authoritative climate study reveals scientific forecasts of imminent doom were drastically wrong.

The Mail on Sunday has obtained the final draft of a report to be published later this month by the UN Intergovernmental Panel on Climate Change (IPCC), the ultimate watchdog whose massive, six-yearly ‘assessments’ are accepted by environmentalists, politicians and experts as the gospel of climate science.

They are cited worldwide to justify swingeing fossil fuel taxes and subsidies for ‘renewable’ energy.

Yet the leaked report makes the extraordinary concession that over the past 15 years, recorded world temperatures have increased at only a quarter of the rate of IPCC claimed when it published its last assessment in 2007.

Back then, it said observed warming over the 15 years from 1990-2005 had taken place at a rate of 0.2C per decade, and it predicted this would continue for the following 20 years, on the basis of forecasts made by computer climate models.

But the new report says the observed warming over the more recent 15 years to 2012 was just 0.05C per decade - below almost all computer predictions.

The 31-page ‘summary for policymakers’ is based on a more technical 2,000-page analysis which will be issued at the same time. It also surprisingly reveals: IPCC scientists accept their forecast computers may have exaggerated the effect of increased carbon emissions on world temperatures  – and not taken enough notice of natural variability.

They recognise the global warming ‘pause’ first reported by The Mail on Sunday last year is real – and concede that their computer models did not predict it. But they cannot explain why world average temperatures have not shown any statistically significant increase since 1997.

lThey admit large parts of the world were as warm as they are now for decades at a time between 950 and 1250 AD – centuries before the Industrial Revolution, and when the population and CO2 levels were both much lower.

lThe IPCC admits that while computer models forecast a decline in Antarctic sea ice, it has actually grown to a new record high. Again, the IPCC cannot say why.

lA forecast in the 2007 report that hurricanes would become more intense has simply been dropped, without mention.

This year has been one of the quietest hurricane seasons in history and the US is currently enjoying its longest-ever period – almost eight years – without a single hurricane of Category 3 or above making landfall.

One of the report’s own authors, Professor Myles Allen, the director of Oxford University’s Climate Research Network, last night said this should be the last IPCC assessment – accusing its cumbersome production process of ‘misrepresenting how science works’.

Despite the many scientific uncertainties disclosed by the leaked report, it nonetheless draws familiar, apocalyptic conclusions – insisting that the IPCC is more confident than ever that global warming is mainly humans’ fault.

It says the world will continue to warm catastrophically unless there is drastic action to curb greenhouse gases – with big rises in sea level, floods, droughts and the disappearance of the Arctic icecap.

Last night Professor Judith Curry, head of climate science at Georgia Institute of Technology in Atlanta, said the leaked summary showed that ‘the science is clearly not settled, and  is in a state of flux’.

Read more:
http://www.dailymail.co.uk/news/article-2420783/Worlds-climate-scientists-confes...

One of the report’s own authors, Professor Myles Allen, the director of Oxford University’s Climate Research Network, last night said this should be the last IPCC assessment – accusing its cumbersome production process of ‘misrepresenting how science works’.

Despite the many scientific uncertainties disclosed by the leaked report, it nonetheless draws familiar, apocalyptic conclusions – insisting that the IPCC is more confident than ever that global warming is mainly humans’ fault.

It says the world will continue to warm catastrophically unless there is drastic action to curb greenhouse gases – with big rises in sea level, floods, droughts and the disappearance of the Arctic icecap.

Last night Professor Judith Curry, head of climate science at Georgia Institute of Technology in Atlanta, said the leaked summary showed that ‘the science is clearly not settled, and  is in a state of flux’.

She said  it therefore made no sense that the IPCC was claiming that its confidence in its forecasts and conclusions has increased.

For example, in the new report, the IPCC says it is ‘extremely likely’ – 95 per cent certain – that human  influence caused more than half  the temperature rises from 1951 to 2010, up from ‘very confident’ –  90 per cent certain – in 2007.

Prof Curry said: ‘This is incomprehensible to me’ – adding that the IPCC projections are ‘overconfident’, especially given the report’s admitted areas of doubt.

Starting a week tomorrow, about 40 of the 250 authors who contributed to the report – and supposedly produced a definitive scientific consensus – will hold a four-day meeting in Stockholm, together with representatives of most of the 195 governments that fund the IPCC, established in 1998 by the World Meteorological Organisation (WMO) and the United Nations Environment Programme (UNEP).

The governments have tabled 1,800 questions and are demanding major revisions, starting with the failure to account for the pause.

Prof Curry said she hoped that  the ‘inconsistencies will be pointed out’ at the meeting, adding: ‘The consensus-seeking process used by the IPCC creates and amplifies biases in the science. It should be abandoned in favour of a more traditional review that presents arguments for and against – which would  better support scientific progress, and be more useful for policy makers.’ Others agree that the unwieldy and expensive IPCC assessment process has now run its course.

Prof Allen said: ‘The idea of producing a document of near-biblical infallibility is a misrepresentation of how science works, and we need to look very carefully about what the IPCC does in future.’

http://www.dailymail.co.uk/news/article-2420783/Worlds-climate-scientists-confes...

The IPCC 1990 FAR predictions were wrong


Have the 1990 IPCC predictions been proved completely, unarguably and utterly wrong? Yes.

They predicted that if our emissions stayed the same, temperatures would rise by 0.3 C per decade, and would be at the very least 0.2, and the most 0.5. Even by the most generous rehash of the data, the highest rate they can find is 0.18 C per decade which is likely an overestimate, and in any case, is below the very least estimate, despite the world’s emissions of CO2 continuing ever higher.

Climate Scientist Matthew England called that “very accurate”. Since when did 0.18 = 0.3? (Shall we call it “climate maths”, or just call it wrong?) The IPCC had a whole barn wall to aim at, and a battalion of government funded gold plated AK-47s to hit the target, but they still missed.

Both England and the ABC owe Minchin an apology.

The un-Skepticalscience page uses a pea and thimble trick to argue the IPCC 1990 predictions were right (“Lessons from Past Climate Predictions: IPCC FAR”). As usual John Cooks site looks  “technical” but uses complexity to hide the way they redefined the prediction in order to pretend it wasn’t wrong. Excuses excuses. Intellectual wordsmiths who bore you to death.

The un-Skepticalscience page essentially says that GHG forcing was lower than the IPCC predicted. So if you allow for the fact that the IPCC got the future concentration of CO2 wrong, then, hey, really their models are “very accurate”. Figure that estimating the concentration of atmospheric CO2 is far simpler chemistry and much less complex than getting the whole kit and caboodle of a climate model to work. If the IPCC don’t even know how big the sinks and sources of CO2 are, why would anyone trust them to get a multivariate equation with clouds, rain and ocean-turnover right?

Here’s how you can spot the pea-and-thimble trick in the un-SkepticalScience site:

1/ There is no direct quote of the IPCC prediction.

2/ The IPCC used the term “prediction” — but unskeptical science repeatedly used the term “projection”. They even retitle graphs.

3/ They didn’t use the original captions on the graphs, instead writing their own.

4/ The IPCC talked of “emissions” leading to a temperature rise. Skeptical Science talks of “radiative forcing”. (A clue, emissions are measured in gigatons, not in W/m2. The SkS page is discussing something other than the main point.)

But if you were a casual reader you wouldn’t know that unless you bothered to be skeptical, and go to the source to check.

Let’s quote the IPCC Prediction:


“If emissions follow a Business-as-usual pattern"

Under the IPCC Business as Usual emissions of greenhouse gases the average rate of increase of global mean temperature during the next century is estimated to be 0.3C per decade (with an uncertainty range of 0.2C – 0.5C)” [IPCC FAR summary]


http://joannenova.com.au/2012/05/the-ipcc-1990-far-predictions-were-wrong/