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Reviewed: Young Earth Creationist books handed out in Scottish primary school


From Truth be Told, one of the books handed out to children at Kirktenholme Primary

My friends in Scotland will know about how a local Church of Christ sect, with the help of missionaries from the US,  successfully infiltrated a Scottish state non-denominational primary school, were only properly scrutinised (after 8 years of activity) when the school chaplain (a sect member) gave the children two fundamentalist Young earth creationist books to take home, and how the sect has now been barred from that school and the two head teachers who made the mistake of trusting them redeployed.

My American friends will be surprised that a school should have a chaplain, let alone at the rest of these extraordinary goings on, about which I shall have much more to say later. I have read the books given out, and prepared a full report on them, which I attach here.

I had previously, as a backgrounder, sent it to some of the parents, to the school itself, and to the local authority that controls the school, before the local authority education officer met parents to discuss the situation. The immediate problem has been dealt with, but I would like to know what steps the school and the Council plan to take to undo the educational damage inflicted by this.

The books are worse than I could have imagined. A mixture of Morris’s The Genesis Flood, Wells’s Icons of Evolution, and the most bizarre imaginings of Ken Ham‘s Creation Museum, all packaged to look like authoritative school books; the more advanced one even had chapter end review quizzes. I would like to know what steps the school, and the local authority that controls it, plan to take to undo the educational damage inflicted by this.

Anyway, It has occurred to me that I must be one of the few people in the world to have actually submitted himself to the tedium of reading these books from cove to cover, so I thought I’d append my report for those interested:  Truth be Told –  and How do we Know God is Real? For these books to be handed out by a school was a betrayal of trust. Their content is contrary to the whole of present-day science, and to the principles and requirements of guidance from the Scottish Department of Education, and the Curriculum for Excellence. Their arguments are a re-hash of a long-refuted “creation science”, a 20th century heresy that has its roots in Henry Morris’s Genesis Flood, and in Seventh Day Adventism, rather than in mainstream Christianity. They are produced by Apologetics Press, the publishing arm of a group of exclusive US sects calling themselves “Churches of Christ”, who “shun” ex-members ( and reject the whole of modern science in favour of their own kind of biblical literalism.

The books are professionally produced, and Truth be Told in particular is formatted in the same way as a real textbook, complete with chapter headings and subheadings, end-of-chapter reviews, quizzes and discussion topics. A diligent pupil receiving these books, as the children at Kirktonholme did, with the blessings of the school, will conclude that the whole of modern cosmology, geology, and biology is fundamentally mistaken, and that those who promulgate it, including their own science teachers, all university biology departments, and all the world’s leading scientific societies, are lying.One particularly nasty feature is that established science is repeatedly misrepresented so as to make it look absurd, and the evidence for it is repeatedly suppressed or, worse, incorrectly described so as to make it seem unconvincing. This is most obviously true in the chapters regarding the age of the earth, the fossil record, and evolution.

The authors have no scientific qualifications. Kyle Butt graduated from a private Churches of Christ university, and his degrees are in Bible and Communications. Eric Lyons’s degrees, from the same university, are in Bible, History, and Ministry.

How do we Know  misdescribes the Big Bang as disorderly (H 14) [1], asserts (H 18 – 39) that because organisms are complex, each species must have been individually designed, and claims (H 40 – 41) that if evolution is true, dogs could give birth to animals that are half-dog and half-cat.

There are also other claims, not strictly scientific, that are repugnant in a pluralist society, such as, that “Only a belief in God can help people understand what actions are truly right and truly wrong.” (H 51); that those who deny the existence of God are “like those people who deny that Americans have ever landed on the moon.” (H 54), that “when a person properly looks at all the evidence with an open mind and honest art, he cannot be an atheist.” (H 55; emphasis in original).

Truth be Told is the worst kind of creationist anti-science, made to look like a real textbook, with chapter end quizzes (sample: Briefly explain why the trilobite is evidence of Creation), claims of fossilised trilobites inside human footprints, that evolutionists are liars who try unsuccessfully to wriggle out of the Second Law, that radiometric dating depends on flawed assumptions, and other long-exploded lies. It says that evolutionists (that would include their own science teachers at school and university) are dishonestly refusing to admit the truth, that the earth is 6,000 years old, that Noah’s flood explains the Grand Canyon, and that people used dinosaurs as beasts of burden. All this presented as real science in a textbook-like format.

Within the first five pages of Truth be Told, I found nine major errors of scientific fact or logic. Even a brief summary of major errors runs to four pages, which I include here for those interested in the detailed arguments. Some of the highlights are:

Ch 1, Origin of the universe, claims that because Big Bangs are not taking place today, the idea is not amenable to scientific testing. False; the Big Bang is accepted because it quantitatively explains Hubble’s Law, the relative abundance of the light elements and their isotopes, the Cosmic Microwave Background and its fluctuations.

Ch 2, Origin of life, describes the unsolved problem of the origin of life as a weakness in the concept of biological evolution. Not so, any more than the unsolved problem of the origin of language is a weakness in the concept of language evolution.

Ch 5, Geology in the fossil record; geological strata are said to be the result of Noah’s flood, and the rapidity of change in special situations, specifically Mount St Helens, is said to argue against the gradualness of average change in general.

Ch 6, The age of the Earth; claims that radiometric decay rates could have been different in the past, although it has been known since 1928 that they could not have, since if they had been all the laws of physics and chemistry, responsible for the formation of rocks, would also have been different.

Ch 7, Dinosaurs and man, says that humans and dinosaurs coexisted, and that there were dinosaurs on Noah’s Ark. It also claims that assorted rock art represents dinosaurs, speculates that humans could have used dinosaurs as beasts of burden, and even has pictures of dinosaurs pulling carts.

Ch 8, Arguing against evolution, misrepresents the facts regarding embryo development, and, of course, the peppered moth story.

Ch 9, The origin of humans, concentrates on errors from many decades ago, and dismisses intermediate forms such as Homo habilis because they are not fully human (of course they are not. That’s the whole point)

Ch 10, Creation Scientists, is shameless. It lists Louis Pasteur (died 1895) and Sir Isaac Newton (died 1727), and confuses belief in God with belief in the kind of creationism described here. In addition, the book repeatedly accuses evolutionists (remember that this includes the science teachers they will be meeting later, as well as virtually all research scientists) of deliberate disregard and distortion of the evidence, and refusal to admit the truth.

In more tedious detail [you don’t really need to read this unless you want to]:

Ch 1: that the Big Bank was an explosion, sending lumps of matter shooting through space (false; it was a highly orderly event, and lumps of matter only condensed out much later), that acceptance of the Big Bang is of relevance to the acceptance of biological evolution (they are completely different topics), that because Big Bangs are not taking place today, the idea is not amenable to scientific testing(false; the Big Bang is accepted because it quantitatively explains Hubble’s Law, the relative abundance of the light elements and their isotopes, the Cosmic Microwave Background and its fluctuations), and that that a scientific law is “a principle in nature that is true in every observable case”, that (referring presumably the situation existing shortly after the Big Bang), “a tiny ball of matter is not an adequate cause” for our enormous universe (false; this claim neglects the effects of almost 14 billion years of expansion). The chapter also miss describes the use of the terms “law” and “theory” in science, and invokes an imaginary Law of Cause and Effect, which in reality is routinely violated by events at the quantum level, including according to some current thinking the Big Bang itself.

Ch 1 also incorrectly states that the Big Bang theory violates the First and Second Laws of thermodynamics. False; the First Law is not violated because the positive energy of the contents of the universe is exactly balanced by its negative gravitational energy, and the Big Bang was a highly orderly event, not disorderly as stated here. All of this is clearly laid out in many popular books on the subject. Most seriously, T 11 incorrectly invokes the Second Law as saying that the spontaneous pattern formation required by evolution could not occur. In reality, the spontaneous formation of new patterns in far from equilibrium systems, of which he Earth-Sun-Space system is an example, has been known for many decades, and was the subject of Ilya Prigogine’s 1977 Nobel Prize.

T13 on describes the suitability of the Earth to life as clear evidence of providence. False; examining two of the examples given, the ozone layer is the inevitable result of the Sun’s UV light, and the Earth’s magnetic field is the inevitable result of its molten core, which in turn is the inevitable result of its composition and mode of formation. Subsequent pages point out ways in which the World is just right for us; but of course it is, since it is the World that we have evolved in.

Ch 2 describes the unsolved problem of the origin of life as a weakness in the concept of biological evolution. Not so, any more than the unsolved problem of the origin of language is a weakness in the concept of language evolution. This chapter also completely misdescribes conditions on the early Earth, current thinking on the origins of life, and the very restricted role now claimed for the Urey-Miller experiment. The claim that the work of Redi and Pasteur, refuting 18th-century theories of spontaneous generation, has any relevance to what could have happened over tens of millions of years on the early Earth is ridiculous.

Ch 3 misdescribes evolution, chooses Darwin’s finches as an example but ignores extensive recent studies, and claims that mutations cannot generate new information on the grounds that they merely rearrange existing material (this is like saying that an author does not generate new information, because he is merely rearranging existing words). It ignores well established cases of adaptation, such as (within humans) lactose tolerance in pastoral peoples, and resistance to local diseases.

Ch 4 asserts that “Design demands a designer” (this is simply asserting what it claims to prove), and points to good design within the human body while completely neglecting the cases of bad design (such as hernias, choking, the blind spot in the eye, along with many others) that can only be understood as evolutionary relics.  Like so much of the creationist literature, the book at this point misquotes Darwin on the subject of the eye.

Ch 5, on the geological record, is a travesty. Geological strata are said to be the result of Noah’s flood. The fact that fossil tree trunks rise up through several layers of later sediment is said to refute the claim that these sediments accumulated over millions of years. The complexity of the trilobite eye is said to refute the plain fact that from the bottom up (i.e., according to three centuries of geology, but not according to this book, from older sediments onwards) the totality of life has become more complex and diverse. We have the usual (for the creationist literature) misdescription of uniformitarianism, and the claim that the rapidity of change in special situations, specifically Mount St Helens, argues against the gradualness of change on average.

Ch 6, the age of the earth, repeats the usual nonsense about radiometric dating depending on doubtful assumptions. In reality, the mineralogical assumptions made in the early work have been bypassed since the 1940s by the use of isochron dating techniques, while the “assumption” that decay rates have remained constant has been known, since George Gamow’s work in 1928, to be a necessary consequence of the fact that more fundamental quantities, such as the speed of light and the charge on the electron, have remained constant. If this were not so, we would not have had rocks laid down according to the laws of chemistry and physics in the first place.

At this point, the specific Young Earth agenda comes into its own. If tree ring dating places a piece of wood at 10,000 years old, this book claims that this is simply because it was created with 4000 years worth of tree rings inside it. Here we also meet the first flat-out piece of fiction. The book says that there are human footprints in coal layers dated at 250 million years old.

Next come the usual and long refuted creationist arguments for a young Earth. The Earth’s magnetic field is decaying. Indeed it is (and we know that it has decayed and even changed direction many times in the past). The book then says that therefore, the Earth a few thousand years ago would have been so hot it would have cracked. This is nonsense on so many levels that I hardly know where to start. It is claimed that if the universe were billions, or even millions, of years old, then all the hydrogen would long since have been changed into helium. Again this is nonsense. We know how fast hydrogen is being converted into helium in the Sun, from how bright it is, and this fits well with the established age for the solar system of a little over 4.5 billion years. There is a ludicrous argument from population statistics, which effectively assumes a rate of growth over evolutionary time comparable with that only made possible since the development of agriculture.

At this point, the lies become embarrassing. T 109 says that “archaeologists have documented time and again that the period between the time of Abraham and the time of Jesus was about 2000 years. Who do not believe in God… admit that this is true.” In reality, there is no archaeological evidence for Abraham.

Ch 7, Dinosaurs and man, says that it “simply is not true” that dinosaurs lived millions of years before humans, and that “there is much evidence which shows that humans, dinosaurs, and other extinct animals lived together only a few thousand years ago”. Abstract and fanciful monsters found in ancient art are described as evidence for dinosaurs. Herodotus’ description of remains of flying snakes resembling bats is taken as evidence for him having seen pterosaurs, even though pterosaurs are not in the least bit bat-like.  T 121 misdescribes collagen residues preserved in one tyrannosaur fossil by tight binding to bone as “soft issue”.

T 120 and T 121 accuse science textbooks of lying. T 120: “The reason you do not see it [the evidence that humans lived alongside dinosaurs] in your school science books is because it stands opposed to evolution…. When we look at the evidence, we can see the truth.” T 121: “Evolutionary scientists should admit… that dinosaur bones are not millions of years old…. An honest person who found soft issue in a dinosaur fossil would admit that the fossil could not be millions of years old.”

The rest of this chapter suggests that, by analogy with elephants and orcas, humans might have tamed dinosaurs, and shows (T 125, 132) humans interacting with dinosaurs and using them as beasts of burden. We are told that there were dinosaurs on the Ark, and there is discussion of how they could have been fitted in. Dinosaur graveyards are attributed to dinosaurs being drowned in Noah’s Flood.

Ch 8, Evolution is not a proven fact, starts off as is customary in the creationist literature with an attack on Haeckel’s drawings, ignoring everything that has been learnt about development since. It misdraws the human embryo as having the shape of a fully formed human, confuses gill slits with gill arches, and suppresses such well-known facts as the presence of fur and tails on human embryos at around six months. Next (T 138 – 139) we have the peppered moth story, complete with accusations that the camouflage story was false, and that “even though many of the writers and science have book publishers knew was false, they used it anyway” [emphasis in original].

By chance, I wrote at length about this a few weeks ago ( There was no fraud. There were inadequacies in the original experiments. These were repeated, and the results confirmed and placed on a sound footing. That is how science works.

The story of horse evolution is misrepresented on the basis of a quote mined from 1953, while that of whale evolution incorrectly asserts that the evolutionary account is based on only a few bones, and suppresses the fact that we have a complete sequence of over 18 separate stages connecting whales with their terrestrial ancestors. We have confusion between analogy and homology, and misdescription of the evidence from vestigial organs. The chapter ends with the claim that the ability of vestigial organs to perform a new function is evidence against evolution. On the contrary, it is evidence for what is known as exaptation, a powerful evolutionary mechanism.

Ch 9, Did humans evolve? Suppresses the evidence for some 20 species more or less intermediate between us and our common ancestor with chimpanzees, makes great play with frauds and errors long since disposed of, misdescribes Homo habilis as merely an ape and therefore irrelevant in human evolution (the opposite is the case; its position on the borderline between Australopithecus and Homo is evidence that the continuity that creationists deny).

Ch 10, Creation Scientists, is shameless. It lists Louis Pasteur (died 1895) and Sir Isaac Newton (died 1727), and confuses belief in God with belief in the kind of creationism described here.

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[1] References with page numbers; H, How do we Know, T, Truth be Told

Religion and Creationism in Schools: England, Scotland, and the US

In the US, the Establishment Clause of the First Amendment is generally agreed, despite the ravings of a few noisy radical revisionists, to imply that no Government-run institution, such as a public school, can advocate a religion or sponsor any kind of religious observance.

In the UK, the very opposite is the case (I would like to hear from readers about how this matter is handled in other countries). Schools are actually required to incorporate both Religious Education and Religious Observance into their timetables. Religious Observance means, in general, a school assembly with hymns and prayers, and may also include taking part in church services, and visits from ministers of religion. Religious Education, in theory at least, is something entirely different – a faith-neutral liberal arts subject, explaining without proselytising what the contents are of the world’s main religions, and how they respond to philosophical scrutiny. In practice, the teaching tends to be heavily weighted towards Christianity, which is perhaps well justified given Western cultural traditions. Less justifiable is a tendency to assume that Christianity is true, a difficult problem to avoid when most of those who opt to teach the subject will themselves be believers. There is also a very specific problem in primary schools, where the boundaries between different subjects is blurred, and where children hearing, for example, the story of Noah’s Ark will not know whether it belongs alongside the story of Little Red Riding Hood, or of dinosaurs, or somewhere else altogether.

In principle, parents (or, above a certain level, pupils) have the right to withdraw from Religious Observance and/or Religious Education. Reality on the ground is more complicated, if only because of bureaucratic hurdles, and the entire Religious Observance system is coming under increased critical scrutiny. I will report further on this as events unfold.

As a result of these different attitudes towards religion in schools, the tactics adopted by creationists in the US and  the UK are diametrically opposed (I discussed this on pandasthumb a couple of years ago). American creationists claim to be teaching the best available science, and support this claim by describing parallel universes, in which (for example) the fossil record is full of inexplicable gaps, while the Grand Canyon is readily explainable in terms of Noah’s flood. Pandering politicians then claim to be exposing schoolchildren to the best available science, or educating them by exposure to a concocted controversy. In England, officially at least, the authorities are having none of it. After some close questioning, in which I am proud to have played a part, the Education Secretary was pressured into describing himself as “crystal clear that teaching creationism is at odds with scientific fact”, and the Department of Education also clearly states in its materials that it recognises Intelligent Design as a variety of creationism.

None of this, however, affects what happens in Religious Education, as long as it doesn’t claim to be science. So creationists in England, trying to smuggle their material into schools, will find it much easier if they can do so in the name of teaching about religion. This is a growing problem, in view of the current Government policy of establishing schools free from local authority control, many of them run by groups with religious affiliations. Then the way is open for pupils to be taught evolution as an examination requirement, while also hearing it that it is in conflict with the school’s preferred interpretation of Christianity, or (a recently emerging problem in England) that it is un-Koranic.

In Scotland, the situation is different again. Education is “devolved”, meaning that it is the responsibility of the Scottish Parliament in Edinburgh, rather than the UK Parliament at Westminster. Evolution is in the syllabus, but when it comes to creationism and Intelligent Design the Scottish Qualifications Authority has repeatedly ignored calls from teachers and others requesting guidance similar to that on offer in England. The stated reason, incredibly, is that no such guidance is necessary, because creationism is not a problem in Scottish schools.[1] As for the actual motivation, that requires a little knowledge of the present state of Scottish society. Growing numbers of Scots, especially younger Scots, have no religious affiliation, and secular marriages (in Registry Offices, or carried out by recognized Humanist celebrants) outnumber religious marriages. On the other hand, Biblical literalism retains its hold in some areas, especially the Highlands and Islands, where a former Moderator of the Free Church of Scotland (not to be confused with the Church of Scotland, nor with the Free Presbyterian Church, or others with almost identical names) continues to describe evolution as “dangerous pseudoscience”. Scottish politics is in a state of flux, with the collapse of support for the Westminster coalition parties and an upcoming referendum on total independence, so the Education Minister in Edinburgh doesn’t want to upset anyone. But if he lets his civil servants says anything on the topic, someone is bound to be upset, and his only escape is to pretend that nothing needs to be said.

More later.

[1] SQA to me, 4 Nov 2010: “There is no evidence from HMIE [Her Majesty’s Inspectorate of Education] school inspections or other sources to suggest that creationism or ID is currently being taught in schools in Scotland.”

Jerry Coyne at the Glasgow Skeptics – a personal account

Monday night, November 26, I had the great pleasure of hearing Jerry Coyne at the Glasgow Skeptics on the subject of  Why Evolution is True (And Why Most People Don’t Believe It), and had a short enjoyable chat with him in the interval. This report reflects his views, and on occasion mine. To avoid misunderstanding, I should emphasise that it does not represent BCSE as an organisation, which is neutral on matters of faith.

He was aware of and approved of the broad coalition, ranging from Richard Dawkins to Canons of the Church of England, that forced the UK Government to clarify its position against creationism. I had to tell him that Gove had nonetheless ignored his own guidelines by allowing creationist groups to set up publicly funded schools. We had some discussion about whether different religions had different degrees of tolerance towards evolution; I suggested that the reason I was much more accommodationist than him, is that for me religion suggested positions like C of E, whereas for him it suggested anti-intellectual fundamentalism. He seemed to take kindly to this idea, and also to my suggestion that different varieties of religion may differ greatly in their willingness to accept evolution.

Most of his talk covered much the same ground as his book, Why Evolution is True (a must read if you haven’t already), though I certainly benefited from seeing the argument laid out in such concentrated form, and am posting my notes on this part of the talk separately.

Jerry quoted depressing statistics, mainly from the US, about how few people accepted evolution and how many preferred creationism. According to a 2005 Harris poll, only 12% of Americans thought that only evolution should be taught in schools, while 23% thought that only creationism should be taught, and most wanted both.

Why does this matter? Because evolution is a matter of self-knowledge, basic knowledge about what kind of place the Universe is, and our place in it. It is a wonderful example of science in action, and besides, there’s a lot of cool stuff in there.

After discussing the science, he made some very interesting observations about how societies react to it. Given that the evidence for evolution is so overwhelming, why do so many people continue to deny it, and why are the numbers so slow to change? In the US, since 1982, the proportion of creationists has held steady at 44%, those believing in theistic evolution has changed from 38% to 36%, and the only notable change has been an increase in acceptance of materialistic evolution from 9% to 14%, no doubt reflecting the growing number of unbelievers. (I think that the preference for theistic over naturalistic evolution may be less worrying than it sounds, since I doubt if many people distinguish between overall divine control of nature, which would be perfectly compatible with naturalistic evolution, and specific supernatural intervention in the process, which would not).

Clearly, a situation where more Americans believe in the reality of angels than accept evolution is deeply worrying.

So why is evolution so maligned by religion? Because it undermines religious views of human specialness, and of the purpose and meaning of individual life, and (a common and deeply felt objection) is seen as undermining morality. If we compare different countries, religious belief has a powerful negative correlation with acceptance of evolution. It would follow that if we want people to accept evolution, what we need to do is weaken the influence of religion. In support, Jerry quoted a survey according to which, if faced with a scientific finding that contradicted the tenets of their faith, 64% of Americans said that they would reject the finding.

What I found most interesting was Jerry’s quoting from recent (2009 and 2011) studies, showing that religion correlates with social dysfunction (see ) and economic inequality (see ; cut and paste links if necessary). If so, the way to improve public acceptance of science may be to tackle inequality and social dysfunction. This would point in the direction of very broad alliances indeed, and I can see how recent political campaigns in the US may have made this prospect more attractive.

We are left with a final paradox. People fear evolution, seeing it as subversive of morality. And yet, the more moral (in the matters that seem to me most important), the more equitable, and the more effectively functioning a society, the more accepting it is of evolution.

Global warming: Yes it’s real and yes it’s CO2-driven; a former sceptic speaks his mind

Scientists are supposed to change their minds when the balance of evidence changes. In my experience, this doesn’t always happen, but one very respected scientist who has changed his mind, not once but twice, and very publicly, is Prof Richard Muller of the Berkeley Earth Land Temperature Project, UC Berkeley, and Lawrence Berkeley National Laboratory.

Three years ago, he was among the few remaining respected scientists to reject the IPCC (Intergovernmental Panel on Climate Change) analysis of current climate, and unconvinced that significant climate change was happening at all, let alone that it might be driven by human activity. Not surprising, then, that a consortium of those with an interest in denial funded his BEST (Berkeley Earth Surface Temperature) project, to carry out a completely independent, assumption-free, analysis of the data. They got more than they bargained for.

First, BEST concluded, in findings published last year, that warming is indeed taking place as asserted by the overwhelming majority of the climate science community. Now, even more significantly, BEST has taken the position, in a paper submitted to The Third Santa Fe Conference on Global and Regional Climate Change, that CO2 is the most significant driver, that the IPCC estimate of the effect of CO2 (3oC warming for each doubling of CO2 concentration) is accurate, and that the amount of warming from the 1950s to the 2000s (0.87 +/- 0.05 oC) is if anything slightly more than the IPCC estimate.

Moreover, the BEST publications analyse and dismantle all the standard objections to this work. Yes, there are effects due to volcanoes. I don’t think anyone denies this. The 1991 Mount Pinatubo eruption led to summers bad enough to force up the price of potatoes, but earlier events, such as the eruptions of Laki in 1783, Tambora in 1815, and Cosiguina in 1835, were much more significant. We know this from accounts at the time, and can quantitatively estimate the intensity of the eruptions by the amount of sulphate in ice cores. The late 18th and early 19th century data are good enough to provide a scaling factor (0.15 oC cooling per gigatonne emitted sulphate), showing that, by contrast, the overall effect of volcanoes in the 20th century has been insignificant. No, there is no significant effect attributable to the Sun. No, there are no artefacts due to the number and location of climate stations, although this has not stopped WattsUp, a Koch-funded enterprise, from raising this yet again in response to Muller. There is some variability connected with oscillations in the Atlantic, which may be responsible for the 0.17 oC variation from the simplest model. This model, which attributes all change to a linear volcanic effect, and a logarithmic CO2 effect, is remarkably successful. In the light of Muller’s work there is no excuse for invoking alleged scientific uncertainty to delay urgent consideration of the effects of further increasing CO2 concentrations, and the appropriate policy responses.

There are some particular words of caution. We don’t understand why the difference between day and night time temperatures decreased from 1900 to 1987, but then started rising again. We can’t be certain that present temperatures exceed those of the Mediaeval Warm Period, so beloved of climate “sceptics”, although it seems clear that if things continue as they are, the issue will be beyond all doubt. Warming has not led to more hurricanes, and the heat wave afflicting the United States this summer is local rather than global.

Muller’s approach includes the effects to date of one important feedback, the positive feedback due to the fact that ocean warming leads to increased concentrations of water vapour, the most significant of all greenhouse gases. However, of necessity, it neglects effects that have not yet kicked in, most of which can only add to our concerns. A tiny minority of climate scientists still maintain that increased cloud cover will moderate the effects of warming, but the evidence (see Science 2009, 325, 376, for a discussion) now shows that the opposite is true. Melting of sea and land ice will speed up warming, by reducing the Earth’s albedo, the fraction of incident sunlight that is reflected straight back into space, since exposed ground, crops, and open ocean absorb more energy and snow and ice. There is the prospect of release of methane from thawing tundra, and increased release of carbon dioxide from soils, as bacterial activity increases with warming. The only negative feedback in prospect is the greater reflectivity of deserts, as compared with cultivated land, but that is the last thing we should be looking forward to.

Thus Muller’s approach offers us the lowest credible estimate of what is in store for us. Despite which, opposition parties in Australia and the US, including one US presidential candidate, and a vocal faction within the United Kingdom’s governing Conservative Party, continue, and may be expected to indefinitely continue, in their denial that any real problem has been shown to exist.

I find this frightening.

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