Our Future World: CSIRO research of megatrends, megashocks & future scenarios

Dr Stefan Hajkowicz gave an interesting presentation on 12 July 2010 in Brisbane, Australia, on recent CSIRO research of megatrends, megashocks and future scenarios.

Stefan is the co-author of Our Future World: an analysis of global trends, shocks and scenarios, released by CSIRO in April 2010. The report is being used to guide CSIRO’s research investment strategy.

The report defined a “megatrend” as “a collection of trends, patterns of economic, social or environmental activity that will change the way people live and the science and technology products they demand.”

The five interrelated megatrends identified in the report are:

  1. More from less. This relates to the world’s depleting natural resources and increasing demand for those resources through economic and population growth. Coming decades will see a focus on resource use efficiency.
  2. A personal touch. Growth of the services sector of western economies is being followed by a second wave of innovation aimed at tailoring and targeting services.
  3. Divergent demographics. The populations of OECD countries are ageing and experiencing lifestyle and diet related health problems. At the same time there are high fertility rates and problems of not enough food for millions in poor countries.
  4. On the move. People are changing jobs and careers more often, moving house more often, commuting further to work and travelling around the world more often.
  5. i World. Everything in the natural world will have a digital counterpart. Computing power and memory storage are improving rapidly. Many more devices are getting connected to the internet.

I attended the presentation interested to think outside my normal (environmental law) box and to hear how future scenarios could incorporate climate change impacts. Ove was also there to listen in.

While the Stefan’s presentation did include a significant component on “TRIAGE” for the Murray-Darling and coral reefs due to over-allocation of water and climate change respectively, I came away fairly disappointed with the scientific validity of the analysis that was presented.

The major failing of the analysis is that it treats climate change as only as seemingly minor component within megatrend 1 and there was no reference at all to ocean acidification.

In fact, climate change is only mentioned in megatrend 1 tangentially through reference to “growth in the global carbon market”.

The only direct reference to climate change in the report is in the megashock section of the report through identification of “extreme climate change related weather.”

Incidentally, the full list of environment-related global risks identified in the report are:

  • Extreme climate change related weather
  • Droughts and desertification
  • Loss of freshwater
  • Cyclone
  • Earthquake
  • Inland flooding
  • Coastal flooding
  • Air pollution
  • Biodiversity loss

Ocean acidification, the “evil twin” of climate change, is not mentioned anywhere in the report.

It is hard to reconcile the failure in the report to recognise climate change and ocean acidification as a megatrend in their own right with the peer-reviewed literature or numerous synthesis reports of leading scientific bodies, including but far from limited to IPCC 2007.

Just read the abstract of one of the many recent review articles on climate change and ocean acidification to understand the dystopia that current science foresees in the near-term future for the world’s oceans based on current and likely future trends in carbon dioxide emissions (Hoegh-Guldberg et al 2007):

“Atmospheric carbon dioxide concentration is expected to exceed 500 parts per million and global temperatures to rise by at least 2°C by 2050 to 2100, values that significantly exceed those of at least the past 420,000 years during which most extant marine organisms evolved. Under conditions expected in the 21st century, global warming and ocean acidification will compromise carbonate accretion, with corals becoming increasingly rare on reef systems. The result will be less diverse reef communities and carbonate reef structures that fail to be maintained. Climate change also exacerbates local stresses from declining water quality and overexploitation of key species, driving reefs increasingly toward the tipping point for functional collapse. This review presents future scenarios for coral reefs that predict increasingly serious consequences for reef-associated fisheries, tourism, coastal protection, and people. As the International Year of the Reef 2008 begins, scaled-up management intervention and decisive action on global emissions are required if the loss of coral-dominated ecosystems is to be avoided.”

Stefan wondered during his presentation into the climate change thicket when discussing the rapidly rising middle-class in India and said “we must fix poverty before we fix climate change.”

To me that sounded a lot like Bjørn Lomborg’s misguided argument that climate change should be given a low priority because increasing the world’s riches will solve climate change in the future without costly interventions or unpopular behavioural change now. Understandably Lomborg is thin on the details of how this magic transition will occur.

Like Lomborg’s work, the analysis reflects an economist’s rosy confidence in market forces and humanity’s technological capacity to solve all problems. Also like Lomborg’s work, more attention to the physics and chemistry of the world’s atmosphere and oceans would improve its usefulness as a guide to the future.

Overall, it was a thought-provoking presentation and a report that is well worth a look at but there is a serious discrepancy between the analysis and the world that climate science suggests is our most likely future.

Unlike their treatment in this analysis, climate change and ocean acidification should be regarded as a megatrend in their own right as they are fundamentally altering the world we live in on a massive scale and they will continue to impact on all aspects of life in the future.

Page photo: “Dystopia” by Moebius (Hat-tip to Climate Progress)

Monckton responds to Abraham in the predictable way

Update 19/7/10: The Support John Abraham page now has over 900 signatories, and a Facebook group has also been set up.  John Abraham has the full support of his university – contrast with the tone of response that Christopher Monckton appears to favour and it is becomes very hard to see how someone could take Monckton’s arguments seriously.

…..

John Abraham from St Thomas University recently presented an extraordinarily detailed rebuttal of a sample of Christopher Monckton’s arguments.  After his initial response a few weeks ago, Monckton has not only asked Prof. Abraham to answer 446 questions about his presentation, but has now appealed to readers of Watts Up With That to pressure his university for the removal of the presentation, and to “instigate a disciplinary inquiry into the Professor’s unprofessional conduct”.

A page has been created where you can show your support for John Abraham by commenting in the thread. More details over at Skeptical Science and Deltoid.

A climate storm for investors

By Paul Gilding | July 12th, 2010 | Category: Cockatoo Chronicles

Beware the coming climate storm. A moment is approaching when science and markets will collide, but then merge, with chilling consequences for investors who miss the moment, and great excitement for those who are well prepared.

The signs are all around us now. Signs that a storm of climate action will soon rage through the economy, sweeping away denial and, along with it, those companies, politicians, investors and industries that aren’t ready.

Signs like our past two Prime Ministers and opposition leaders  in Australia being removed with climate change a central issue in their downfalls. Signs like 2008 being the first year when the money invested globally in new renewable energy generation projects was greater than that invested in new fossil fuel energy generation. Signs like the last decade being the hottest on record, as of course each decade has been since 1980. Signs like the first new car company IPO in the USA for half a century being a disruptive electric car company.

There is great investment and excitement now in renewables, with over $100 billion invested in 2008 and the same in 2009, despite the uncertain financial climate. Yet we see growth in coalmines, new coal export facilities and a lack of action in politics in Australia and the US. What is an investor to do with such confusing signals?

Simple. Observe the science, because the science drives everything else.

The facts are now very straightforward on the problem and its causes, as stated by the peak US science body The National Academies of Sciences. They said last month the science of climate change is in the category of those theories that had “been so thoroughly examined and tested, and supported by so many independent observations and results, that their likelihood of subsequently being found to be wrong is vanishingly small. Such conclusions and theories are then regarded as settled facts.”

So this is not a philosophy or a political viewpoint. These are facts. Smart investors deal in rational analysis, not ideological perspectives or wishful thinking. As US Senator Daniel Patrick Moynihan said “Everyone is entitled to his own opinion, but not to his own facts.”

So if you believe in facts, you will be understand that science will, in the end, overcome resistance and denial, as argued by Professor Stephan Lewandowsky from the University of Western Australia: “The laws of physics will relentlessly assert themselves, unswayed by public opinion, political shenanigans, or elections. Ultimately, the laws of physics will speak so loudly that no amount of wishful thinking can prevent them from being heard.”

The reason we can be so confident that this storm, when it hits, will be ferocious and effective at driving change, is by considering what happens when science meets markets. The science dictates that when we act it will now have to be dramatic action.

We know that to avoid catastrophic risk we must keep warming below two degrees and, as a result, this is the target agreed to by governments from US, to China, to India to Australia. If you don’t like political metrics then consider that this is also the target endorsed by hundreds of global corporations from GE to Rio to HSBC.

Acting as late as we are, achieving this target will require us to virtually eliminate CO2 emissions from coal oil and gas within a few decades. This means eliminating whole industries and replacing them, which is where the science meets the market.

Markets are particularly good at challenges like this, using what Austrian economist Joseph Schumpter called “creative destruction”. Markets are unconcerned about collateral damage and friendly fire. They won’t deliver the change steadily or calmly. Markets don’t play politics and will have no regard for sunk capital or prior commitments.

When we act on climate this will be creative destruction on steroids, with the resulting economic storm wreaking havoc and wiping out companies and whole sectors, while creating tomorrow’s new economy and corporate giants. It will be volatile, chaotic and exciting for investors, with fortunes made and lost based on the quality of judgements.

It’s hard to look at today’s politics and investment strategies and accept this analysis. It’s hard to imagine so many people being so wrong. It was also hard to imagine, in 2007, that the world’s governments would nationalise banks and car companies and spend trillions bailing out the financial system. It was hard to imagine, in the USA in 1940, that the coming four years would see military spending go from 1.6 per cent to 37 per cent of GDP and that government would take over and direct the economy, with actions like banning the production of private vehicles. In hindsight, though, such things are always obvious. And with the benefit of hindsight in 10 years time, the coming climate storm will have been obvious as well.

There is only question you have to ask yourself when you see the signals that are now flashing in bright neon lights, screaming “warning, warning, everything is about to change”. Am I ready?

It’s not climate change, it’s ocean change!

Ove and I just published an op-ed in the News and Observer here titled “In the oceans, the heat is really on”.  The graphic that really says it all:

Redrawn by John Cook with data from Murphy, D. M., S. Solomon, R. W. Portmann, K. H. Rosenlof, P. M. Forster, and T. Wong. 2009. An observationally based energy balance for the Earth since 1950. J. Geophys. Res. 114:D17107. doi:10.1029/2009JD012105

The oceans are choking on greenhouse gases. Our emissions are changing ocean temperature, pH and circulation with wide-ranging effects on biological productivity and ecosystem health. These are among the conclusions of five review articles published in a special feature on the oceans in a recent issue of Science magazine.

The world is saturated by coverage of the oil spill in the Gulf of Mexico. Yet the impacts of this tragedy are localized, short-term and trivial compared to the broader effects of climate change.

The oil spill has damaged the lives and businesses of many innocent people. Remarkably, however, every day we are releasing several thousand times as much carbon as the Gulf spill by driving, flying and consuming and by heating and cooling our energy-inefficient houses. Hundreds of years from now, when BP is forgotten and the gulf wetlands have healed, ocean life will still be affected by the fossil fuels we are burning today.

Nearly all of the debate – or at least what is depicted in the media as a debate – about global warming has focused on land surface temperatures. However, over 85 percent of the extra energy trapped by soaring greenhouse gases has gone into the ocean.

We all call this man-made catastrophe “global warming” or “climate change,” but “ocean warming” and “ocean change” are really more descriptive of what is happening.

One value of the Gulf spill is that it has highlighted how tightly coupled the health of ecosystems and human economic well-being really are. In retrospect, the costs of preventing the spill by installing more reliable safety systems are paltry in comparison to the economic losses in the tourism and fisheries sectors. The same is true for mitigating climate change. Responses that cost less than 1 percent of GDP growth over the next few decades are matched against massive impacts on people and industry, especially in coastal areas of the world.

Greenhouse gas emissions are rapidly changing the physical properties and key biological process in the ocean. For example, declining primary productivity is affecting ocean food webs, fisheries and the ability of the ocean to naturally absorb and store greenhouse gases.

Other ominous signs loom. Deepwater dead zones have expanded, probably due to both local nutrient pollution as well as climate change. The melting of Arctic sea ice will allow thousands of species from the north Pacific to colonize the Atlantic. This will be the first mixing of the distinct biota of these regions in nearly a million years. Similar changes are expected in Antarctica, where warming is enabling marine predators to invade shallow-water ecosystems for which the freezing temperatures have been an effective barrier for 40 million years.

To avoid these uncertain worlds, a growing number of scientists from a range of fields have advocated that we keep the concentrations of atmospheric carbon dioxide below 450 ppm (parts per million). To achieve this, we need to cut global emissions by 5 percent per annum starting right now.

A tall order. However, we have no other alternative given the extremely high costs of inaction.

The good news is that there are plenty of solutions at hand, including investment in renewable energy systems or avoiding deforestation. National support for creating competitive renewable energy supplies would cause the required changes to ripple through global economies. Halting deforestation in Brazil and Indonesia would eliminate nearly 20 percent of greenhouse gas emissions. Protecting and restoring coastal vegetation, including mangroves, salt marsh and sea grasses – dubbed “blue carbon” – would maintain or increase the ability of marine ecosystems to capture and permanently store carbon dioxide. Furthermore, all of these solutions have huge benefits for people and biodiversity.

The world’s scientists are calling for society and policymakers to wake up to the perils of our current greenhouse gas emission pathway. This is not merely the consensus of scientists; it is a consensus of evidence. Inaction might be justified if the impacts were trivial or there was nothing we could do to avoid these catastrophic futures. However, with so many affordable solutions in front of the world’s nations, continued inaction is no longer an excuse.

Poor journalism plagues The Australian front page yet again.

UPDATE:  See the facts and figures about The Australian’s war on Science over at Deltoid.

No doubt you will remember The Australian’s infamous front page story that was exposed on Media Watch by Jonathan Holmes.  Well, it seems that the poor journalism continues at The Australian.  In a front page article entitled “U.N.’s climate report ‘one-sided‘, Ben Webster tries to claim that the Dutch study has revealed serious errors in the IPCC fourth assessment report.

Well, it seems that Ben and The Australian got it all backwards yet again.

The Dutch study actually concludes the complete opposite – that statements within the “impacts, adaptation and vulnerability” section of the IPCC AR4 report were “well founded and none were found to contain any significant errors”. The Dutch study recommended a number of ways to strengthen upcoming reports and eliminate a number of small errors which cropped up.

Was Ben off reading right-wing fossil fuel funded blogs again?  Or was it a case of the ‘ole let’s make up the news when it gets to be all too boring?

What is truly remarkable is that The Australian tries to imply that the report also concluded that the evidence concerning the extreme risk of climate change to Great Barrier Reef was “alarmist”.  A careful reading of the report reveals that the study did not conclude that evidence or the conclusions were alarmist.  Rather, it pointed to a couple of slightly inaccurate references to the peer-reviewed literature.  In fact, it concludes after doing so that “We consider this to be a minor comment”.

Talking to the experts, you find that few have problems with the IPCC statement that “60 per cent of the Great Barrier Reef was projected to suffer regular bleaching by 2020 “. You see, we already are. We have had bleaching since 1979 (and none before) with significant recent events in 1998, 2002 and 2006.  Sounds regular to me!  In several of these events (1998, 2002), more than 50% of the Great Barrier Reef has been affected.

Of course, Australia’s Andrew Bolt has responded with his mirror of this misinformation. Helpful fellow that he is.

Where has Ben Webster and the Australian been? The real shame here is the erosion of trust that we can place in one of our leading papers. With a repeated offences like this like this, why would you read The Australian?  Certainly, not if you wanted to get the facts on any particular issue!

To really understand what the Dutch report says, we recommend readers go to the original report or a rational report such as that in the leading international science magazine, Nature.  Here is what Reuters had to say:

Few fishy facts found in climate report

Dutch investigation supports key warnings from the IPCC’s most recent assessment.

Quirin Schiermeier

05 Jul 2010 14:22:00 GMT

Written by: Laurie Goering

Rajendra Pachauri, head of the United Nations Intergovernmental Panel on Climate Change (IPCC), has defended his science body’s work, saying any errors in its reports were minor. A new Dutch report agrees with that assessment. REUTERS/Bob Strong

In the latest of a series of reports backing the validity of work by leading climate scientists, the Dutch government said Monday that a review of a key report by the United Nations Intergovernmental Panel on Climate Change (IPCC) had found no significant errors.

The Netherlands Environmental Assessment Agency took a look at the IPCC’s Fourth Assessment Report, a 2007 study considered the basis for understanding climate change science, following criticism that the report had in several instances exaggerated climate impacts.

IPCC officials admitted one important mistake – an exaggeration of the rate of melting of Himalayan glaciers – but noted that the error shouldn’t be used to invalidate the rest of the 3,000-page report.

The Netherlands government agreed with that conclusion in its study of the “impacts, adaptation and vulnerability” section of the report, which looks at regional impacts of climate change.

Reviewers found that statements in the section are “well founded and none were found to contain any significant errors,” though some minor errors cropped up. They issued a set of recommendations on how to strengthen upcoming reports, with a view to eradicating such mistakes.

Representatives of the thousands of leading international climate scientists who volunteer their time to produce the reports called the Dutch study a validation of their work, which won a 2007 Nobel Peace Prize.

“The review is explicit in its finding that the key conclusions of the IPCC Fourth Assessment Report are accurate, correct and supported entirely by the leading science in the field,” said Martin Parry, co-chair of the team that produced the “impacts, adaptation and vulnerability” section of the 2007 report.

Climate scientists, under broad attack by sceptics of climate change science, have in recent weeks enjoyed a welcome series of victories. Michael Mann, a Pennsylvania State University climate scientist embroiled in a high-profile stolen email scandal at the University of East Anglia, was exonerated of charges of research misconduct and ethical lapses last week after a review by his university.

Reuters AlertNet is not responsible for the content of external websites.

“You could make a fairly tight argument to say that it is the single greatest health threat that has ever faced the human species. I suspect this will shorten lives, if it turns out that this is what’s going on”

Analysis of nearly 1,000 sperm whale tissues (sampled using a dart gun, not the Japanese harpoon method) reveals ‘jaw dropping’ levels of cadmium, aluminum, chromium, lead, silver, mercury, and titanium:

“The entire ocean life is just loaded with a series of contaminants, most of which have been released by human beings,’’ Payne said in an interview at the International Whaling Commission’s annual meeting.

“These contaminants, I think, are threatening the human food supply. They certainly are threatening the whales and the other animals that live in the ocean,’’ he said.

Roger Payne (a man with some pretty serious whale science credentials, being the first researcher to document whale songs back in the late 1960’s) went on to say “You could make a fairly tight argument to say that it is the single greatest health threat that has ever faced the human species. I suspect this will shorten lives, if it turns out that this is what’s going on”. If this holds true, it’s pretty disturbing:

“The biggest surprise was chromium,’’ Payne said. “That’s an absolute shocker. Nobody was even looking for it.’’

Chromium, a corrosion-resistant material, is used in stainless steel, paints, dyes, and the tanning of leather, and can cause lung cancer in people who work in industries where it is commonly used.

Wise applied chromium to healthy whale cells in the laboratory to study its effect. He found that the concentration of chromium found in whales was several times higher than the level required to kill healthy cells in a petri dish, Payne said.

Link to full story here.

University of Queensland Scientist named Coordinating Lead Author for next IPCC report

Go Ove!

The Director of UQ’s Global Change Institute, Professor Ove Hoegh-Guldberg, has been selected as the Coordinating Lead Author of Chapter 30, “Open Oceans”, to the Working Group II (WGII) contribution of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC).

The Fifth Assessment Report (AR5), scheduled for completion in 2013-2014, will be the next comprehensive assessment of all aspects of climate change by the IPCC.

UQ Vice-Chancellor & President Professor Paul Greenfield said Professor Ove Hoegh-Guldberg was an excellent scientist and a fine choice by the IPCC.

“Ove has pioneered knowledge of the links between climate change and coral reefs,” Professor Greenfield said.

“His service to the IPCC will exemplify how UQ researchers can help communities around the world understand and manage the most challenging issues.”

The IPCC Working Group II assesses the vulnerability of socio-economic and natural systems to climate change, negative and positive consequences of climate change, and options for adapting to its consequences.

Coordinating Lead Authors play a leading role in ensuring that any cross-cutting scientific or technical issues, which may involve several sections of a report, are addressed in a complete and coherent manner and reflect the latest information available.

The author teams will conduct the scientific-technical assessment using procedures that emphasise comprehensiveness, scientific independence, openness, thorough review and transparency.

Professor Hoegh-Guldberg has published works that include over 180 refereed publications and book chapters and is one of the most cited authors within the peer-reviewed literature on climate change and its impacts on natural ecosystems.

Other Coordinating Lead Authors from Australia in Working Group II include:

• Roger Jones, Victoria University, Ch. 2, “Foundations for Decision Making”
• Ian Noble, The World Bank, Ch. 14, “Adaptation Needs and Options”
• Roger Kitching, Griffith University, Ch. 25, “Australasia”
• Roger McLean, University of New South Wales, Ch. 29 “Small Islands”

A number of other Australians have also been selected to participate in WGII as Contributing Authors and Reviewing Editors, as the work on the Fifth Assessment Report progresses.

A full list of the authors may be accessed at http://www.ipcc-wg2.gov/AR5/AR5_authors.html.
More information about the IPCC’s 5AR may be found at http://www.ipcc-wg2.gov/AR5/ar5.html.

Chemosynthesis: dark water communities in the Gulf of Mexico live off crude oil as a primary food source

Here’s an interesting perspective on the current oil spill from the NYT: cold, dark, teeming with life:

The deep seabed was once considered a biological desert. Life, the logic went, was synonymous with light and photosynthesis. The sun powered the planet’s food chains, and only a few scavengers could ply the preternaturally dark abyss.

Then, in 1977, oceanographers working in the deep Pacific stumbled on bizarre ecosystems lush with clams, mussels and big tube worms — a cornucopia of abyssal life built on microbes that thrived in hot, mineral-rich waters welling up from volcanic cracks, feeding on the chemicals that leached into the seawater and serving as the basis for whole chains of life that got along just fine without sunlight.

In 1984, scientists found that the heat was not necessary. In exploring the depths of the Gulf of Mexico, they discovered sunless habitats powered by a new form of nourishment. The microbes that founded the food chain lived not on hot minerals but on cold petrochemicals seeping up from the icy seabed (Read More)

Reply to Ridd et al.’s Technical Comment to Science: “Have coral calcification rates slowed in the last twenty years?”

Several denialists have sort to deliberately confuse the readership over the important evidence gathered by De’ath et al. (2009) on slowing coral calcification on the Great Barrier Reef.  Given the recent resurgence in this misinformation, I thought it would be a good idea to post Dr Glenn De’ath, Dr Janice M. Lough and Dr Katharina E. Fabricius’s recent reply  to Dr Peter Ridd’s confused and misleading claims.

The maintenance of coral calcification rates is critical for the future of coral reefs and it is, therefore, important to identify spatial patterns and temporal trends in the rates of coral calcification. Our recent report showed that substantial declines in coral calcification have occurred on the Great Barrier Reef in the last 20 years (De’ath et al., 2009), and similar reports are now emerging from other parts of the world (Tanzil et al., 2009). Ridd et al. here suggest that (1) ontogenetic effects, and (2) the last data points at the end of the recent cores, largely explain the ~14% decline in coral calcification we have shown across the Great Barrier Reef. We believe the assertions of Ridd et al. are erroneous due to: (1) their invalid assumptions about the data, and (2) their inappropriate statistical analyses.

Ontogenetic effects

Ridd et al. argue that we ignored the possibility that ontogentic effects contributed to the reported decline, namely that corals in their youngest years calcify at a faster rate than later in life. However, their main underlying assumption, that age of each short core is given by its number of growth records is wrong. Thus their Fig 2b derived from this assumption, is also wrong. Short cores are ~50 cm long (the length of the coring barrel), whereas the median height of the corals from which the short cores were taken was 1.5 m. The innermost year bands in short cores do not thus reflect early years of the corals’ life in the colonies sampled. Rather, corals were on average ~50 years old (rather than 1 year old, as Ridd et al assume) when the innermost year ring of the short cores was deposited.

In contrast, ontogenetic effects can be accurately assessed in whole colonies where the first years of the corals are preserved. However, Ridd et al. do not include year as a covariate factor, so their analysis is unable to disentangle the two potentially confounded effects of age and temporal trends in environmental conditions.

In the Report, we also investigated ontogenetic effects by comparing calcification in the last 15 years in the life of a coral (the outermost bands) in the 189 colonies collected from 1990 to 2005, and the 139 colonies sampled prior to 1990. We showed that for the cohort prior to 1990, the number of colonies and the number of reefs with increasing and declining rates were approximately equal in number, with 29 of the 56 reefs (51.7%) declining at an average rate of 0.11% yr-1 (SE=0.18%). However, in the 1990–2005 period, 12 of the 13 reefs (92.3%) declined at an average rate of 1.44% yr-1 (SE=0.31%), indicating a strong decline specific to that period, rather than reflecting ontogenetic properties of the outermost annual growth bands in coral skeletons.

End of core data

Ridd et al. argue that the last annual growth layer for each coral of the 2004 and 2005 series are negatively biased estimates of growth due to unspecified problems of measurement and should, therefore, be discarded. Such specific measurement problems are only likely if those corals were measured separately from the remainder. This was not the case as the data are based on the re-measuring and re-dating of all the material using the same methods and the same instrument, and conducted by one person (JML) within the past 5 years.

Ridd et al also argue that the series ending in 2005 (21 corals) did not show a significant decline in 2004, when the series ending in 2004 (containing 77 corals) showed a decline. It is perhaps also worth noting that Ridd et al use the term “significant” on six occasions without any statistical reference or justification. This statement was neither supported by their Fig 1D, nor by any form of statistical analysis or significance tests.

However, we also re-ran the temporal change model excluding the records of corals in 2004-5 (Fig. 1). The decline in calcification from 1990 – 2005 reduces to ~77% of that predicted when all data were included; still a decline of ~11.0%.

Figure 1. Decline in calcification based on all data and with the final years records for 2004-5 removed. The predicted reduction in the current decline for 1990-2005 is reduced from ~14.2% to ~11.0%.

Statistical analyses

Ridd et al. standardise the measurements of individual calcification records, average them for each year, and then analyse the temporal trends using an antiquated smoothing technique (Savitzky-Golay, 1964). There are three major problems with their approach:

(1)   It fails to account for the sampling structure whereby coral colonies are sampled from different reefs in highly variable numbers. There are between 1 and 46 colonies per reef, and the analyses in De’ath et al (2009) accounts for this structure by including random effects of reef and colony nested in reef in their generalized additive models (GAMs). The latter approach also takes into account the correlation across time due to repeated measures on colonies.

(2)   The fitted curves of Ridd et al. have no basis for the selection of smoothness (such procedures did not exist in 1964) and are mostly over-fitted (i.e. they are too wriggly), in particular in the last few years at which time Ridd et al. claim the anomalies exist. For example, the rapid increase in the last year or so of the truncated series is extreme. This contrasts with the failure of their fit to capture a rapid rise in the period 1940-45. All efforts to recapture their fits (no details were provided in Ridd et al.) failed despite using the Savitzky-Golay procedure with a wide range of smoothing.

The analyses of De’ath et al (2009) [SOM] used widely accepted model selection procedures for both random and fixed effect components of the GAMs, within which the smoothness of the temporal profiles was based on cross-validation.

(3)   None of Ridd et al.’s analyses use an inferential statistical model other than linear regression in their Fig. 2., and in that instance no confidence intervals or significance of the regressions are provided. It is also clear from inspection of those plots that strong serial correlation is present, which is not catered for in their analyses.

Conclusion

For the above reasons, we disagree with Ridd et al that the observed declines in coral calcification on the Great Barrier Reef are due to ontogenetic effects in corals, and that the last two years of record should be omitted from the data set. The predicted decline in calcification would drop from ~14.2% to ~11.0% were the last two records omitted; still a major decline. We maintain that this decline in calcification, probably due to synergistic effects of prolonged and repeated temperature stress and ocean acidification in tropical waters, is a real and serious issue for massive Porites on the Great Barrier Reef, and indeed for coral reefs around the world (Tanzil et al., 2009).

Dr Glenn De’ath, Dr Janice M. Lough and Dr Katharina E. Fabricius

Australian Institute of Marine Science, PMB 3, Townsville Qld 4810, Australia.

Expert credibility in climate change: not all climate research and expertise are equal.

A fairly convoluted (but interesting none the less) paper just got published in PNAS by Anderegg et al (2010) looking at climate change and scientific credibility (more coverage by the Guardian here). Why don’t we trust climate scientists? To answer this question, the authors conducted a literature search of 1,372 climate researchers whose work “constitutes expertise or credibility in technical and policy-relevant scientific research”, and conclude what we’ve been blogging here for some time: “Despite media tendencies to present both sides in debates, which can contribute to continued public misunderstanding,not all climate researchers are equal in scientific credibility and expertise in the climate system

Although preliminary estimates from published literature and expert surveys suggest striking agreement among climate scientists on the tenets of anthropogenic climate change (ACC), the American public expresses substantial doubt about both the anthropogenic cause and the level of scientific agreement underpinning ACC. A broad analysis of the climate scientist community itself, the distribution of credibility of dissenting researchers relative to agreeing researchers, and the level of agreement among top climate experts has not been conducted and would inform future ACC discussions. Here, we use an extensive dataset of 1,372 climate researchers and their publication and citation data to show that (i) 97–98% of the climate researchers most actively publishing in the field support the tenets of ACC outlined by the Intergovernmental Panel on Climate Change, and (ii) the relative climate expertise and scientific prominence of the researchers unconvinced of ACC are substantially below that of the convinced researchers.

Here’s the nuts and bolts of the paper (CE = convinced by the evidence, UE = unconvinced by the evidence):

So: not only is there a pretty considerable difference between the number of expert researchers between CE and UE groups, the mean expertise of the UE group was around half (60 publications) that of the CE group (119 publications). Here’s the real interesting statistic: researchers with fewer than 20 climate publications comprise ≈80% the UE group, as opposed to less than 10% of the CE group. To quote the authors: “This indicates that the bulk of UE researchers on the most prominent multisignatory statements about climate change have not published extensively in the peer-reviewed climate literature.

From a subsample of the 50 most-published researchers from each group, there was a considerable difference in relative expertise between the CE and UE groups:

Of these top 50 researchers, the CE group have an average of 408 climate publications, whilst the UE researchers averaged only 89 publications. Again, to quote the authors. this suggests that not all experts are equal, and top CE researchers have much stronger expertise in climate science than those in the top UE group“.

So who’s citing who? Anderegg et al use citation metrics to determine “…the quality and impact of a researcher’s contribution—a critical component to overall scientific credibility—as opposed to measuring a researcher’s involvement in a field, or expertise“. In examining the top four most-cited papers for each CE and UE researcher with 20 or more climate publications, the disparity in citation metrics between the CE and UE groups is astonishing:


Conclusions?

(i) 97–98% of the climate researchers most actively publishing in the field support the tenets of Anthropogenic Climate Change (ACC) outlined by the Intergovernmental Panel on Climate Change

(ii) the relative climate expertise and scientific prominence of the researchers unconvinced of ACC are substantially below that of the convinced researchers.

As Phil M commented on a post the other day, the UE group:

1) Also happen to have close ties to fossil fuel & mining industries.
2) Have ties to right wing lobby groups.
3) Have only a handful of scientists who back the denier side, of whom few have published or conducted research in any relevant climate science field, much less publish any papers in reputable journals debunking AGW.
4) Have not a single scientific instituion backing them.

Anderegg W.R.L., Prall J.W., Harold J. & Schneider S.H. (2010 Online Early) Expert credibility in climate change. Proceedings of the National Academy of Sciences 21 June 2010, doi: 10.1073/pnas.1003187107