A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).

The Skeptics Handbook

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The Skeptics Handbook II

Climate Money Paper




The nerds have the numbers on precious metals investments on the ASX

Notching up open review improvements – a correction to Part III

Flagging an update (coming) to Big News Part III

Score 1 for open science review, thanks to Bernie Hutchins, an electrical engineer who diligently asked the right questions about something that bothered him regarding the notching effect. We’re grateful. This will improve the model. On the downside, it means we’re slightly less certain of the delay (darn) — the notch doesn’t guarantee a delay as we had previously thought. But there is independent evidence suggesting temperatures on Earth follow solar activity with a one cycle delay — the lag seen in studies like Archibald, Friis-Christainsen and Usoskin is still a lag.

What does it mean? The step-response graph (figure 2 in Part III or figure 4 in Part IV) will change, and needs to be redone. The reason for assuming there is a delay, and building it into the model, rests now on the independent studies, and not on the notch. The new step change will need to be built into the model, and in a few weeks we’ll know how the predictions or hindcasting change. David feels reasonably sure it won’t make much difference to the broad picture, because a step-response something like figure 4, Part IV, explains global warming [...]

The Solar Model finds a big fall in TSI data that few seem to know about

Leif Svalgaard claims “TSI has not fallen since 2003″. It’s technically true in a sense, but demonstrably false when discussing 11 year smoothed trends (which is written on the graph he was criticizing). Willis Eschenbach sadly was carried along. This post is in response to an overheated thread at WUWT. Both men owe David Evans an apology.

The fuss is over the big fall in TSI.  Leif Svalgaard said it was “almost fraudulent” that we claimed there was a fall in TSI since 2003 since there wasn’t a fall in this dataset. He says: “There is no such drop.” I say, look at the graph below, it’s even in your own data.  Svalgaard provided the link to his TSI set, and we’ve included that line in the graph below. It’s the light-purple line. (Has he paid attention for the last ten years?)

In his rush to call it “totally wrong” and to declare “the model is already falsified” he didn’t notice we were talking about a trend in 11 year smoothed TSI, and the fall is evident in whole cycles (but takes some wisdom to find in daily or monthly data). I guess that’s a mistake that could happen to [...]

BIG NEWS VIII: New solar theory predicts imminent global cooling

To recap — using an optimal Fourier Transform, David Evans discovered a form of notch filter operating between changes in sunlight and temperatures on Earth. This means there must be a delay — probably around 11 years. This not only fitted with the length of the solar dynamo cycle, but also with previous independent work suggesting a lag of ten years or a correlation with the solar activity of the previous cycle. The synopsis then is that solar irradiance (TSI) is a leading indicator of some other effect coming from the Sun after a delay of 11 years or so.

The discovery of this delay is a major clue about the direction of our future climate.  The flickers in sunlight run a whole sunspot cycle ahead of some other force from the sun. Knowing that solar irradiance dropped suddenly from 2003 onwards tells us the rough timing of the fall in temperature that’s coming (just add a solar cycle length). What it doesn’t tell us is the amplitude — the size of the fall. That’s where the model may (or may not) tell us what we want to know. That test is coming, and very soon. This is an unusual [...]

BIG NEWS Part VII — Hindcasting with the Solar Model

The Solar Series: I Background   |  II: The notch filter  |  III: The delay  |  IV: A new solar force?  |  V: Modeling the escaping heat.  |  VI: The solar climate model   |  VII — Hindcasting (You are here)   | VIII — Predictions

All models are wrong, some are useful. That’s how all modelers speak (except perhaps some climate scientists).

The barriers to making a good climate model are many. The data is short, noisy, adjusted, and many factors are simultaneously at work, some not well described yet. Climate modeling is in its infancy, yet billions of dollars rests on the assumption that CO2 will cause catastrophic warming and the evidence that most recent warming was due to CO2 comes entirely out of models. It’s important to focus on the pea:

“No climate model that has used natural forcing only has reproduced the observed global mean warming trend” (IPCC 2007)

It is a crucial plank that modelers say “we can’t explain the current warming without CO2″. Current climate models assume that changes in solar radiation have a small immediate effect and [...]

BIG NEWS part VI: Building a new solar climate model with the notch filter

The Solar Series: I Background |  II: The notch filter  |  III: The delay  |  IV: A new solar force?  |  V: Modeling the escaping heat.  |  VI: The solar climate model (You are here)  |  VII — Hindcasting   | VIII — Predictions

Open Science live — The story so far: Dr David Evans is building the O-D notch-delay solar model. It’s a much simpler big-picture approach than Global Climate Coupled Models. They use an ambitious bottom-up system where the models add up every small aspect in every small cell of the Earth’s climate atmosphere and oceans and try to predict everything, but the trap is the errors — small errors in 10,000 calculations add up to big-mush. David’s approach is top-down. He looks at the whole system from the outside, and doesn’t try to understand or predict each individual part. It’s a way of starting at the start — to shed light on the big forces and processes that happen as energy arrives on Earth, gets reflected, or blended, and eventually changes the surface temperature. His model won’t tell us what happens to rainfall in Sudan in 2050, but [...]

BIG NEWS Part V: Escaping heat. The Three pipes theory and the RATS multiplier

The Solar Series: I Background   |  II: The notch filter  |  III: The delay  |  IV: A new solar force?  |  V: Modeling the escaping heat (You are here).  |  VI: The solar climate model   |  VII — Hindcasting   | VIII — Predictions

David Evans has analyzed the black box system that is effectively  “Sunlight In, Temperature Out”, and found a notch, a delay, and a low pass filter. The problem then is to work out their order and to fill in any other bits needed by the model. This post then, doesn’t have big blockbuster moments (sorry), but these points need to be said.

Energy leaves Earth through a range of electromagnetic frequencies, but the bulk of them can be grouped into three main “pipes”. Radiation either comes directly off the land, oceans, ice and what-not on the ground, or it leaves via the atmosphere. Up in the air, carbon dioxide and water molecules do most of the work sending emissions of infra red to outer space.  In the atmosphere, the radiating “surface” is a virtual concept and is effectively at different heights for different greenhouse gases. This is all [...]

BIG NEWS part IV: A huge leap understanding the mysterious 11 year solar delay

The Solar Series: I Background   |  II: The notch filter  |  III: The delay  |  IV: A new solar force? (You are here)  |  V: Modeling the escaping heat.  |  VI: The solar climate model   |  VII — Hindcasting   | VIII — Predictions

Implacably, the discovery of a notch suggests a delay of anything from 10 to 20 years but most likely 11 years. (Don’t miss the delay post — two very big important concepts out in two posts). The big mystery is what could cause such a long delay in the correlation of solar radiation with temperatures on Earth?

David and I spent months wondering “what on Earth” could drive it. There were many possibilities though none of them seemed to be able to respond with the right timing: A resonant slop in ocean circulation could absorb extra energy, but it was difficult to see how the timing would be so tight with solar peaks. Likewise changes in ice or land cover. Then there are lunar cycles of 9 – 18 years, potentially generating atmospheric standing waves, but they were not synchronous with the sun.

Given that marine life can [...]

BIG NEWS Part III: The notch means a delay

The Solar Series: I Background  |  II: The notch filter  |  III: The delay (you are here)  |  IV: A new solar force?  |  V: Modeling the escaping heat.  |  VI: The solar climate model   |  VII — Hindcasting   | VIII — Predictions

UPDATE: July 21 Thanks to Bernie Hutchins, David found a problem with the code, which means the notch no longer guarantees a delay. The delay still likely exists (see the other evidence in the references below) but this post, particularly figure 2 needs correction and updating. – Jo

Strap yourself in. The Notch in the Earth’s response to incoming solar energy means that every 11 years  (roughly) the solar energy peaks, and at the same time the climate’s response to the extra energy changes. What on Earth is going on?

The thing about notch filters that is hard for anyone who isn’t an electrical engineer to understand is that it appears to start working before “the event” it is filtering out. This is obvious in the step response graph. That’s Figure 2 – which shows what happens where there is a [...]

BIG NEWS Part II: For the first time – a mysterious notch filter found in the climate

The Solar Series: I Background   |  II: The notch filter (you are here)  |  III: The delay  |  IV: A new solar force?  |  V: Modeling the escaping heat.  |  VI: The solar climate model   |  VII — Hindcasting   | VIII — Predictions

This is the first of many posts. It is primarily about the entirely new discovery of a notch filter, which electrical engineers will immediately recognize, but few others will know. Notch filters are used in electronics to filter out a hum or noise. You will have some at home, but everyone seems to have missed the largest notch filter running on the planet.

This post is also about the broad outline of the new solar model. It’s a O-D (zero-dimensional) model. Its strength lies in its simplicity — it’s a top down approach. That solves a lot of problems the larger ambitious GCMs create — they are a bottom up approach, and effectively drown in the noise and uncertainty. This model does not even attempt to predict regional or seasonal effects at this stage. First things first — we need [...]

BIG NEWS Part I: Historic development — New Solar climate model coming

Behind the scenes a major advance has been quietly churning. It is something I have barely even hinted at. (Oh how I wanted to!)You may have noticed my other half Dr David Evans has been quiet — it’s not because he’s moved out of the climate debate, instead a strange combination of factors has pulled him full time into climate research. Things have been very busy here. He’s discovered something extraordinary, and like all real science, it’s been a roller-coaster where the theory appeared to collapse, and we nearly gave up, but then a new insight would turn out to be more valuable than the version that went before. Other times it all seemed so obvious in hindsight we wondered why no one had done this before. But the answer is that there is a very unusual combination of factors at work — how many people have Ivy League experience in Fourier maths, and electrical circuits and have worked as a professional  modeler, software developer, and have an interest in the finer details and theory of the climate debate? Who of the people with this background would also be prepared to spend months working unpaid to investigate a non-CO2 climate [...]

Full UnCut video now available – “I Can Change Your Mind” Evans, Nova, Minchin & Rose.

Thanks to Frank Brus, at least one camera is now on YouTube in full, with sound. Many thanks to other skeptics who volunteered with other helpful suggestions and ideas: to J.J., Ruth, Jim, and Raymond. Thanks to Steve for info about bit-torrent (at least we don’t have to go there this time).

An excellent talent pool out there. I didn’t even know some people had access to post Very Long Movies on Youtube (1 hour 56 mins.) Some of my favourite points are at the end. Check out the last 15 minutes.

There were two cameras recording at the same time:

 View 2 (Front more distant camera)

OR (UPDATE)  View 1 (Back camera view) closer.

 Thanks to Barry Corke for driving hundreds of kilometers with his high tech equipment to record this for no fee at all!


The original post has all the background and information on this video:  ABC Doco “UnCut”: Evans, Nova, Minchin and Rose — the full unedited video. Look for the moment when Anna is surprised we agree with CO2 being a greenhouse gas: “How can you be skeptical?” Notice when she describes David’s modeling work as “data entry”.

The videos posted [...]

Buy gold while it’s in the ground (Plus David and Jo will be in Sydney at the Gold Symposium – Monday)

UPDATED (Already)  Money is grubby thing, but financial independence means freedom. Freedom to spend time writing what a heart believes instead of what an employer demands. (Freedom to follow the most inexplicable whim — like tossing the 9-5 day to debate details of dendroclimatology with people who detest you). I wouldn’t be able to indulge in the luxury of writing this blog if it weren’t for the gold shares that keep food on the table. Next Monday David is speaking at The Gold Symposium in Sydney. (I’ll be in the audience.) Who should go? — only people who don’t want to be poor. I want to see both these independent conferences succeed (The AEF too), I want to share the word about both money and science, and I want to help independent spirits meet up. That’s why I’m giving them both a shameless plug before the article. There is a big overlap between gold and skepticism: skeptical of government science often means skeptical of government money too (see We are all Austrians now). For the pure-science readers here, it may all seem thoroughly odd, but while some will paint gold as a fatuous symbol of pointless wealth – and sometimes [...]

Compulsive namecallers: nutter, conspiracy theorist, anti-semitic, denier — trying to censor through denigration

Got no evidence? Can’t hold a rational discussion? Just call people names — smear them.

David Evans (my other half) pointed out that anyone who opposed the regulating class gets called a racist sooner or later (see those quotes at the end). Now it’s happened to him. Two weeks after getting a mention of climate “feedbacks” into The Age, he’s being called antisemitic. And on what basis? Wait for it… two years ago, on a different topic, Dr David Evans wrote the word “Rothschilds”. Then those who can’t think, but were keen to do a character assassination, leapt to use their psychic abilities, crack secret codes, and drew on their best kindergarten reasoning to call that “antisemitic”. The essay was about banking history and systematic flaws in our currency system, and there was no mention of any religion or any race. But no matter, it’s just another variation of the pathetic Holocaust denier meme. It’s what a smear-artist does — denigrate speakers to try to stop people hearing their message.

As usual, a lack of evidence doesn’t stop the rabid conspiracy-theory-spotters from writing reams of speculation about something that isn’t there and never was.  David has never mentioned anything about [...]

David Evans in the Fairfax press: Climate change science is a load of hot air and warmists are wrong

Today in the Sydney Morning Herald and The Age, for the first time, David Evans has been published in the Op-Ed section. Something is going on in those newsrooms…? This article, below, simply makes the point that the models amplify the direct effect of CO2 by a factor of three and that is where the most important uncertainties lie. This key factor in the debate — which we cover repeatedly on this blog– has virtually never been made before in these newspapers which are the major dailies for Australia’s two largest cities. Any debate about the effects of CO2 needs to start with the fact that most of the warming in the models comes from amplification of humidity and clouds. If the models were right about water vapor, we would have found that missing hot spot.  –   Jo  PS: The SMH and The AGE have both closed comments already! Have they run out of electrons? Oh my? Or were they afraid the comments looked like a debate?

UPDATE: I’ve just posted that these major dailies have “disappeared” the Muller conversion article too!


Dr David M.W. Evans

31 Jul 2012

Climate scientists’ theories, flawed as they are, ignore [...]

David Evans explains the skeptics case (YouTube)

Last week we finished some YouTube versions explaining the skeptical case. These grew out of the interview we did with Nick Minchin and Anna Rose for the  ABC documentary I Can Change Your Mind. They are what we would have said, if we’d been editing the documentary .

In the interview we were on a mission to show the evidence the ABC won’t show — and of course, true to form, the ABC did exactly that, and didn’t show it. As David often points out, the mainstream media have never shown this data anywhere in the world, ever, even though it is extremely relevant, from mankind’s best and latest instruments, from impeccable sources, and is publicly available. Not to mention that billions of dollars of public policies depend on getting this right either.

This is a strictly no-budget approach to organize the message for those on the web who prefer to see video’s rather than read papers. Here are three YouTube’s by David Evans, thanks to Barry Corke (for the filming and editing). I hear that one I did will be ready sometime.

A little background. When the documentary interview happened in our kitchen, we noticed something interesting. We felt [...]

The end of the Global Warming Scare would look a lot like this

Soon, the moment will come when the crowd will say “I always knew it was fake”.

Here are three signs we are at the beginning of The End.

1. Op-Ed writers will be pointing out how governments are unwinding  policies: Dominic Lawson: Britain Has Finally Rejected The Bogus Economics Of Climate Change. Germany (home of half the worlds solar energy production)  is winding up its pursuit of renewables, and eight Eastern European nations said “No Thanks” (legally) to the EU’s authoritarian dictat on carbon emissions, and hardly anyone complained…

And which energy source is ecologically correct Germany now developing faster than any other? Lignite, otherwise known as brown coal, the most carbon- intensive fuel known to modern man.

This makes the countries on the European Union’s eastern borders (notably Poland, for which indigenous coal is a dominant energy source) even more reluctant to accept the national emissions targets promoted by Brussels. Eight of these nations launched a legal challenge and last week they won a ruling by the European Court of Justice that Brussels had exceeded its powers in imposing such limits. The court brushed aside the European commission’s complaint that it would not otherwise be [...]

Climate Coup — The Politics

How the regulating class is using bogus claims

about climate change to entrench and extend their

economic privileges and political control.

Guest Post: Dr David M.W. Evans, 29 Feb 2012, last updated 13 Mar 2012, latest pdf here

The Science

The sister article Climate Coup—The Science (a more mainstream version of The Skeptic’s Case) contains the science foundation for this essay. It checks the track record of the climate models against our best and latest data, from impeccable sources. It details how you can download this data yourself. It finds that the climate models got all their major predictions wrong:

Test Climate Models Air temperatures from 1988 Actual rise was less than the rise predicted for drastic cuts in CO2 Air temperatures from 1990 Over-estimated trend rise Ocean temperatures from 2003 Over-estimated trend rise greatly Atmospheric hotspot Completely missing –> water vapor feedback not amplifying Outgoing radiation Opposite to reality –> water vapor feedback not amplifying


The latter two items are especially pertinent, because they show that the crucial amplification by water vapor feedback [i] assumed by the models does not exist in reality. Modelers guessed that of the forces on [...]

Dr David Evans: The Skeptic’s Case

A new brief summary of the reasoning and evidence behind the skeptics case. –Jo


The Skeptic’s Case Who Are You Going To Believe – The Government Climate Scientists Or The Data? Guest Post Dr David M.W. Evans

We check the main predictions of the climate models against the best and latest data. Fortunately the climate models got all their major predictions wrong. Why? Every serious skeptical scientist has been consistently saying essentially the same thing for over 20 years, yet most people have never heard the message — here it is, put simply enough for any lay reader willing to pay attention.

What the Government Climate Scientists Say


Figure 1: The climate models. If the CO2 level doubles (as it is on course to do by about 2070 to 2100), the climate models estimate the temperature increase due to that extra CO2 will be about 1.1°C × 3 = 3.3°C. [1]

The direct effect of CO2 is well-established physics, based on laboratory results, and known for over a century.[2]

Feedbacks are due to the ways the Earth reacts to the direct warming effect of the CO2. The threefold amplification by feedbacks is based on the [...]

Dr David Evans: Four fatal pieces of evidence

Dr David Evans lays out four crucial pieces of evidence, and calls for a debate with Prof Andrew Pitman. But the evidence is so unarguably strong for skeptics, we know that the name-calling-team-who-want-our-money will do anything to avoid a public debate. If the evidence is “overwhelming” why are they so unwilling to explain it?  — Jo


Submission to the Inquiry into Carbon Tax Pricing Mechanisms

Dr David Evans

20 September 2011

Dr David Evans consulted full-time for the Australian Greenhouse Office from 1999 to 2005, and part-time to the Department of Climate Change from 2008 to 2010, modeling Australia’s carbon in plants, debris, mulch, soils, and forestry and agricultural products. Evans is a mathematician and engineer, with six university degrees including a PhD from Stanford University.

Global warming has become a scam. Let me explain how it works.

It has superficial plausibility. Yes, global warming is occurring. Yes, carbon dioxide is a greenhouse gas and levels are rising. And yes, every molecule of carbon dioxide we emit causes some global warming.

Many non-scientists think that proves the case, but it doesn’t. In particular, it doesn’t rule out the possibility that carbon dioxide is merely [...]

Monckton Tour Dates

The Australian 2011 Monckton Tour

A Carbon Tax will



Viscount Christopher Monckton will explain why. Dr David Evans and Jo Nova will accompany him in Sydney and Newcastle