Thursday, January 16, 2020

So, this is what "no AGW" looks like


From Real Climate.

Here's what Sinclair Davidson was saying in 2011:
I would like to draw your attention - and your readers - to the work of Professor Terrence Mills of Loughborough University. He has literally written the book on time-series econometrics. He has also written, at least, 3 papers on temperature time-series data. One of the conclusions that he draws is "At the very least, proponents of continuing global warming and climate change would perhaps be wise not to make the recent warming trend in recorded temperatures a central plank in their argument."
The GWPF kept relying on Mills's work, but the obvious flaw with it was explained here:
And so we have the latest such unphysical climate prediction, made in a report by Loughborough University statistics professor Terence Mills, on behalf of the anti-climate policy advocacy group, the Global Warming Policy Foundation (GWPF). The report essentially fits a statistical model to past global and local surface temperature changes, and then uses that statistical model to forecast future temperature changes. It’s an approach that’s been used to predict financial market changes, for example.

The obvious flaw in this application is that the Earth’s climate is a physical system, and the statistical model includes no physics whatsoever. You simply cannot accurately predict how a physical system will change if you ignore physics, like the increasing greenhouse effect. As DeSmogUK put it, the GWPF report predicts no global warming by ignoring the main cause of global warming. And as climate scientist James Annan wrote,
The basic premise is that if you fit a nonsense model with no trend or drift, you generate a forecast with no trend or drift (though with huge uncertainty intervals, necessary to allow for the historical warming we’ve already seen). Amusingly, even with those huge uncertainty intervals, the temperature is already outside them
Or as Ken Rice explained in one of the links above:
Here’s the key point; projecting future warming requires some kind of estimate for future emissions. Trying to forecast future warming using some model with no physics and based only on past temperatures is obvious nonsense. Even a Professor of Statistics should be able to get this utterly trivial point. Maybe Terence Mills is so clueless that he really can’t grasp what is a pretty straightforward concept. 
My first question:  when will Sinclair Davidson admit he was wrong to be so easily influenced by Mills?
Second question:  why does he think there is value in running a blog that is chock full of "there is no AGW" denialism in both posts and comments.

Come on, Sinclair, don't be shy. 

4 comments:

Not Trampis said...

He won't even admit to be completely ans utterly wrong about stagflation. A subject he understood as well as this.
Why would he admit his mistakes here.

GMB said...

No thats all lies. This is fake news. You may as well have gotten this graph out of a crack on a toilet wall. Fake data doesn't count in science. Thats the end of the matter. Get yourself some real data dopey.

GMB said...

It might be helpful if you presented some real world data. That graph has nothing to do with anything on this planet. It may as well have been drawn freehand.

GMB said...

Here is some discussion of this fake news as represented by that lying graph. In this case we even have the words of the people making these fake news graphs.

https://www.youtube.com/watch?v=mGe9JO58Uc8