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A Gem by Lord Monckton

December 12, 2012

Excerpted from:  http://wattsupwiththat.com/2012/12/07/monckton-on-his-smashing-u-n-wall-of-silence-on-lack-of-warming-and-censure/

I had also told her how to check the facts (but she had not checked them):

Step 1. Get the monthly mean global surface temperature anomalies since January 1997 from the Hadley Centre/CRU. The data, freely available online, are the U.N.’s preferred way to measure how much global warming has happened. Or you could use the more reliable satellite data from the University of Alabama at Huntsville or from Remote Sensing Systems Inc.

Step 2. Put the data into Microsoft Excel and use its routine that calculates the least-squares linear-regression trend on the data. Linear regression determines the underlying trend in a dataset over a given period as the slope of the unique straight line through the data that minimizes the sum of the squares of the absolute differences or “residuals” between the points corresponding to each time interval in the data and on the trend-line. Phew! If that is too much like doing real work (though Excel will do it for you at the touch of a button), find a friendly, honest statistician.

Step 3. Look up the measurement uncertainty in the dataset. Since measuring global temperature reliably is quite difficult, properly-collated temperature data are presented as central estimates flanked by upper and lower estimates known as the “error bars”.

Step 4. Check whether the warming (which is the difference between the first and last value on the trend-line) is greater or smaller than the measurement uncertainty. If it is smaller, falling within the error-bars, the trend is statistically indistinguishable from zero. There has been no warming – or, to be mathematically nerdy, there has been no statistically-significant warming.

It doesn’t matter how many profiteering mad scientists say global warming is dangerously accelerating. It isn’t. Period. Get over it.

The fact that there has been no global warming for 16 years is just that – a fact. It does not mean there is no such thing as global warming, or there has not been any global warming in the past, or there will be none in future.

In the global instrumental temperature record, which began in 1860, there have been several periods of ten years or more without global warming. However, precisely because these periods occur frequently, they tend to constrain the overall rate of warming.

Ideally, one should study periods of warming that are either multiples of 60 years or centered on a transition year between the warming and cooling (or cooling and warming) phases of the great ocean oscillations. That way, the distortions caused by the naturally-occurring 30-year cooling and 30-year warming phases are minimized.

Let’s do it. I have had the pleasure of being on the planet for 60 years. I arrived when it first became theoretically possible for our CO2 emissions to have a detectable effect on global temperature. From 1952 to the present, the planet has warmed at a rate equivalent to 1.2 Celsius degrees per century.

Or we could go back to 1990, the year of the first of the four quinquennial Assessment Reports of the Intergovernmental Panel on Climate Change (IPeCaC). It predicted that from 1990-2025 the world would warm at 3.0 Cº/century, giving 1 Cº warming by 2025.

Late in 2001 there was a phase-transition from the warming to the cooling phase of the Pacific Decadal Oscillation, the most influential of the ocean oscillations. From 1990-2001 is 11 years; from 2001-2012 is 11 years. So 1990-2012 is a period centered on a phase-transition: with minimal natural distortion, it will indicate the recent temperature trend.

Since 1990 the world has warmed at 1.4 Cº, century, or a little under 0.3 Cº in all. Note that 1.4 Cº/century is a little greater than the 1.2 Cº/century observed since 1952. However, the period since 1990 is little more than a third of the period since 1952, and shorter periods are liable to exhibit somewhat steeper trends than longer periods.

So the slightly higher warming rate of the more recent period does not necessarily indicate that the warming rate is rising, and it is certainly not rising dangerously.

For the 21st century as a whole, IPeCaC is predicting not 1.2 or 1.4 Cº warming but close to 3 Cº, more than doubling the observed post-1990 warming rate. Or, if you believe the latest scare paper from our old fiends the University of East Anglia, up to 6 Cº, quadrupling it.

That is not at all likely. The maximum warming rate that persisted for at least ten years in the global instrumental record since 1850 has been 0.17 Cº. This rate occurred from 1860-1880; 1910-1940; and 1976-2001.

It is only in the last of these three periods that we could have had any warming influence: yet the rate of warming over that period is the same as in the two previous periods.

All three of these periods of rapidish warming coincided with warming phases of the Pacific Decadal Oscillation. The climate scare got underway about halfway through the 1976-2001 warming phase.

In 1976 there had been an unusually sharp phase-transition from the cooling to the warming phase. By 1988 James Hansen was making his lurid (and now disproven) temperature predictions before the U.S. Congress, after Al Gore and Sen. Tim Wirth had chosen a very hot June day for the hearing and had deliberately turned off the air-conditioning.

Here is a summary of the measured and predicted warming rates:

Measured warming rate, 1997-2012 0.0 Cº/century
Measured warming rate, 1952-2012 1.2 Cº/century
Measured warming rate, 1990-2012 1.4 Cº/century
Measured warming rate, 1860-1880 1.7 Cº/century
Measured warming rate, 1910-1940 1.7 Cº/century
Measured warming rate, 1976-2001 1.7 Cº/century
Predicted warming rate in IPCC (1990), 1990-2025 3.0 Cº/century
Predicted warming rate in IPCC (2007), 2000-2100 3.0 Cº/century
Predicted warming rate by UEA (2012), 2000-2100 4.0-6.0 Cº/century

——————– end of excerpt ———————-

Note that the three rates of warming from 1860 to  1880 and 1910 to 1940 compared to 1976 to 2001 are all the same.

CRU head, Phil Jones said the same thing in his BBC interview:

BBC: Do you agree that according to the global temperature record used by the IPCC, the rates of global warming from 1860-1880, 1910-1940 and 1975-1998 were identical?

 Jones: An initial point to make is that in the responses to these questions I’ve assumed that when you talk about the global temperature record, you mean the record that combines the estimates from land regions with those from the marine regions of the world. CRU produces the land component, with the Met Office Hadley Centre producing the marine component.

 Temperature data for the period 1860-1880 are more uncertain, because of sparser coverage, than for later periods in the 20th Century. The 1860-1880 period is also only 21 years in length. As for the two periods 1910-40 and 1975-1998 the warming rates are not statistically significantly different (see numbers below).

 I have also included the trend over the period 1975 to 2009, which has a very similar trend to the period 1975-1998.

 So, in answer to the question, the warming rates for all 4 periods are similar and not statistically significantly different from each other

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