Matt Ridley and the Wall Street Journal misrepresent paper cited in Ridley column

Equilibrium climate sensitivity (ECS) evaluated from paleoclimatic data (PALAEOSENS group, Rohling et al., 2012).

There’s more to say about the latest attempt to deny the mainstream estimate of equilibrium climate sensitivity (e.g. NRC, 1979; Annan and Hargreaves, 2006; Knutti and Hegerl, 2008; Rohling et al., 2012) by Matt Ridley (remember him?) at the Wall Street Journal later. But I just wanted to point out something rather troubling about one of Ridley’s and Nic Lewis’s (the source of Ridley’s claims) citations.

Ridley claimed:

Some of the best recent observationally based research also points to climate sensitivity being about 1.6°C for a doubling of CO2. An impressive study published this year by Magne Aldrin of the Norwegian Computing Center and colleagues gives a most-likely estimate of 1.6°C.

I recalled the Aldrin et al. paper from the last time it made the rounds in the “skeptic” blogosphere, when Chip Knappenberger cited it as finding a “low” climate sensitivity.

The funny thing about the Aldrin et al. paper is that it really doesn’t find a “low” ECS at all. Their main result is an ECS of 2.0°C, which is completely consistent with the IPCC AR4 range. Moreover, they caution that their main result is incomplete, because it explicitly does not account for the effect of clouds:

When cloud behavior is included as another term, the ECS increases significantly, from ~2.5°C to 3.3°C depending on the values used:

Surely this wasn’t the Aldrin et al. paper Riddley and Lewis were citing as finding an ECS of 1.6°C.

The 1.6°C value literally never appears in the text of the paper.

Of course, it was entirely possible that Aldrin had published another paper on ECS this year finding 1.6°C that I was simply unable to find. I reached out to Bishop Hill and Matt Ridley for some clarification:

  1. thingsbreak
    @aDissentient Which Aldrin 2012 paper was Lewis citing on your blog?
  2. thingsbreak
    @mattwridley Can you provide either the title or the DOI for the Aldrin paper you cited in your WSJ piece? Thanks!
  3. aDissentient
    @thingsbreak Environmetrics 2012; 23: 253–271 Panel A of Fig 6.
  4. thingsbreak
    @aDissentient The one that finds an ECS of 2.5-3.3K when it bothers to account for clouds (4.8)? LOL.
  5. mattwridley
    @thingsbreak… Aldrin, M., et al., 2012. Bayesian estimation of climate sensitiv… Environmetrics, doi:10.1002/env.2140.
  6. thingsbreak
    @mattwridley Did you personally read the paper? Where does the 1.6 number come from? Did you read section 4.8?
  7. aDissentient
    @thingsbreak Most likely values still only 2 ish. If we are to include cloud lifetime effect shld we include other highly uncertain effects?
  8. thingsbreak
    @aDissentient If you’re making a comparison to IPCC values, should use most apples-to-apples comparison, which Aldrin et al. discuss in 4.8.
  9. thingsbreak
    @aDissentient Where does the 1.6 value come from anyway? Literally doesn’t exist in paper.
  10. aDissentient
    @thingsbreak He got it by measuring the graph (It’s actually slightly lower I believe).
  11. mattwridley
    @thingsbreak lewis calculated it from aldrin’s paper’s data/charts and aldrin agreed it is correct
  12. thingsbreak
    @mattwridley Aldrin agreed that apples to apples comparison with IPCC ECS estimates is 1.6K? Doubtful. Directly contradicts paper itself.

I posted the following to Nic Lewis at Bishop Hill’s blog:

I think that some readers, and probably the authors of a paper themselves, might find it at least slightly misleading for you to claim findings on their behalf that the paper itself does not actually state.

The main result from Aldrin et al., as reported by Aldrin et al., is an ECS of 2.0°C. The authors caution that this result probably isn’t an apples to apples comparison to other ECS estimates due to the unaccounted for cloud term, and find that the value increases to ~2.5-3.3°C with clouds.

Rather than report either of these values, you simply claim Aldrin et al. “an impressively thorough study, gives a most likely estimate for ECS of 1.6°C…”.

Ridley likewse claims, “An impressive study published this year by Magne Aldrin of the Norwegian Computing Center and colleagues gives a most-likely estimate of 1.6°C.”

It would be easy for me to lob accusations of bad faith, as we don’t know each other and this is just the internet. Instead, I would encourage you, if your goal is to reach as wide an audience as possible, and try to make an impact beyond the “skeptic” and conservative blogospheres, to be more upfront about the scientific literature about ECS.

Ignoring the two main findings of a paper for values that you’re either estimating from a curve or are creating yourself based on data not used by the paper will be seen by at least some people to be misleading. Claiming that ECS cannot be estimated by paleo data is absurd, especially when so many are aware of efforts like the PALAEOSENS project and various paleoclimatic intercomparison groups.

I won’t attempt to read minds or divine motivations. I will simply suggest that what you have been doing thus far will cause some people to dismiss what you’re trying to say due to perceived dishonesty.

I hope you take this criticism in the constructive context in which it is being offered. There will be plenty of time for name-calling and insults later.


  • Aldrin, M., M. Holden, P. Guttorp, R. B. Skeie, G. Myhre, and T. K. Berntsen (2012), Bayesian estimation of climate sensitivity based on a simple climate model fitted to observations of hemispheric temperatures and global ocean heat content, Environmetrics, 23(3), 253–271, doi:10.1002/env.2140.
  • Annan, J. D., and J. C. Hargreaves (2006), Using multiple observationally-based constraints to estimate climate sensitivity, Geophys. Res. Lett., 33, 4 PP., doi:200610.1029/2005GL025259.
  • Knutti, R., and G. C. Hegerl (2008), The equilibrium sensitivity of the Earth’s temperature to radiation changes, Nature Geoscience, 1(11), 735–743, doi:10.1038/ngeo337.
  • National Research Council (1979),  Carbon Dioxide and Climate: A Scientific Assessment. Washington, DC: The National Academies Press.
  • Rohling, E.J., et al. (2012), Making sense of palaeoclimate sensitivity, Nature, 491(7426), 683–691, doi:10.1038/nature11574.

Yes, Marco Rubio IS a creationist

Some people around the series of tubes are having a laugh at GOP rising star Senator Marco Rubio for saying not only does he not know how old the earth is, but that the issue is a matter of debate between science and creationism:

I’m not a scientist, man. I can tell you what recorded history says, I can tell you what the Bible says, but I think that’s a dispute amongst theologians… I’m not a scientist. I don’t think I’m qualified to answer a question like that. At the end of the day, I think there are multiple theories out there on how the universe was created and I think this is a country where people should have the opportunity to teach them all. I think parents should be able to teach their kids what their faith says, what science says. Whether the Earth was created in 7 days, or 7 actual eras, I’m not sure we’ll ever be able to answer that. It’s one of the great mysteries.

Yes, Senator Rubio, we certainly can answer that.

Some people have taken the devil’s advocate position that what Rubio is saying should be defended, because he makes some mention of deferring to experts, and that’s a step in the right direction relative to the broad anti-science sentiment on the American right.

I don’t think even a generous parsing of Rubio’s comments can support that reading, though. It seems pretty clear that he’s saying we should give false balance between reality and creationist twaddle. And when you look at Rubio’s history, his creationism isn’t all that hard to see.

In Florida in 2008, creationists tried to water down teaching on evolution by introducing SB 2692. Marco Rubio voted in support of this creationist legislation. Moreover, although Senator Rubio seems to indicate in the above quote that he thinks children should be taught both the creationist views of the parents as well as what science actually says, in reality, Rubio opposes public schools teaching science that conflicts with creationist parenting:

The “crux” of the disagreement [over teaching evolution in public schools], according Rubio, is “whether what a parent teaches their children at home should be mocked and derided and undone at the public school level. It goes to the fundamental core of who is ultimately, primarily responsible for the upbringing of children. Is it your public education system or is it your parents?”

Rubio added, “And for me, personally, I don’t want a school system that teaches kids that what they’re learning at home is wrong.”

Senator Rubio is a creationist, who supports creationist legislation, and does not want public schools to teach scientific reality because it conflicts with creationist parenting.

And just a reminder, creationist Senators are nothing particularly new, nor are they restricted to the Republican party:

Friendly Reminder: The DDT-Holocaust Hoax promoters don’t actually care about malaria deaths

As previously discussed on this blog and elsewhere (e.g. Deltoid, Slate), there is a form of denialism based on the lie that hippies are responsible for millions of deaths due to malaria because they effected a ban on DDT. This is simply and unequivocally false.

But the people perpetuating the DDT-holocaust lie don’t care about facts. Moreover, they don’t actually care about people dying from malaria.

If they did, they would be up in arms about this.

The DDT-holocaust lie promoters like Fred Pearce and Roy Spencer have not and will not say a word about it. Because they are frauds.

Christopher Monckton, birther – Part IV

Words fail. Previous entries here, here, and here.

Hurricane Sandy and the Climate Hens

Image courtesy of NASA, used under Creative Commons

Hurricane Sandy is one for the record books in a number of senses, and as New York and the world struggle to grapple with its enormity, some discussion has turned to climate change. A topic that has been damningly absent from discussion in the U.S. Presidential election.

It is inevitable that when anyone anywhere tries to talk about climate change in relation to things in the here and now rather than some murky, distant future, a particular group descends to cluck their tongues and admonish everyone that climate change can’t be tied to any individual event (a proposition that is not true, and grows increasingly less defensible as the field of fractional attribution matures). This group includes many who also fall into the camp of those who style themselves as non-partisans or above the “tribal” nature of climate debates. The parallels with Jay Rosen’s larger media critique of the View from Nowhere have been noted by Michael Tobis among others.

Dave Roberts has a thoughtful piece about this phenomenon. He refers to this group as climate “scolds” in contrast to climate hawks (and yes, I do have my own problems with the latter moniker). And while I do think that “scold” captures a lot of the flavor of the group Roberts is describing, I think the hawk vs. “___” setup favors a different term for the group: climate hens.

Image courtesy of Flickr user “Ann Blair”, used under Creative Commons

Climate hens by and large acknowledge the human perturbation of the climate system. But they are very, very hesitant to highlight (or are even downright resistant to) the idea that humans are shaping the present climate in ways that are affecting the public now. This may be because it doesn’t jibe with what they learned about climate years ago. It may be because they view erring on the side of making climate change seem more serious than it is to be as bad or worse than denying that it’s a problem. It may be because they don’t really understand climate science very well- Eric Berger and Roger Pielke Jr., for instance, are two climate hens that have displayed a remarkable ignorance about basic aspects of climate science pertaining to natural variability in a warming world. (Pielke Jr. is also infamous for playing bait and switch by turning conversations about human contribution to extreme events into discussions about an economic signal in normalized disaster losses.) Whatever the reason, climate hens are just plain uncomfortable with people attempting to tie extreme events to our increasing influence on the planet’s climate.

Roberts points out, correctly and convincingly, that the climate hens are clucking about a problem that doesn’t really exist- at least not the one that they’re ostensibly worried about. When the general public sees something like the record US heat, the summer drought, or a hurricane like Sandy, and they start asking about global warming, they don’t really want a belabored lecture on fractional attribution or paleoclimatic precedents that the climate hens think should determine the answer. What the public is looking for is some way to connect this thing- that scientists are telling them is real and a real problem- to their own experiences of the world. That’s what we humans do. Climate hens are, by mistake or by design, frustrating one of the best avenues of facilitating public recognition of climate change as a problem they need to take seriously. Roberts frames it this way:

That’s the key missing ingredient on climate change: not a technical understanding of stochastic modeling, forensic attribution, and degrees of probability, but a visceral, more-than-intellectual sense of what climate change means. Most people simply lack a social and ethical context for it, so they end up jamming it into other, more familiar contexts (“big government,” “environmental problem,” “liberal special interest group”).

A storm like Sandy provides an opportunity for those who understand climate change to help construct that context. It provides a set of experiences — a set of images, sounds, smells, feelings, experiences — that can inscribe climate change with the cultural resonance it lacks. That’s what persuades and motivates people: not the clinical language of science, but experiences and emotions and associations. Of course communicating scientific facts is important too, but it’s not the primary need, nor the standard by which other communications should be judged. What scolds often do is interpret the language of emotion and association through the filter of science. That’s neither helpful nor admirable.

And this perspective has supporters amongst those studying climate communication. Elke Weber (2010) makes this point:

Behavioral research over the past 30 years strongly suggests that attention-catching and emotionally engaging informational interventions may be required to engender the public concern necessary for individual or collective action in response to climate change… To the extent that time-delayed consequences of our actions do not attract the attention or generate the concern ex-ante that they would seem to warrant ex-post, behavioral research provides some corrective actions. The concretization of future events and moving them closer in time and space seem to hold promise as interventions that will raise visceral concern.

The science of tropical cyclogenesis in a warming world is undoubtedly complex and uncertain- a point I’ve been making for years. But when the public starts asking questions about climate after an event like Hurricane Sandy, they aren’t looking for navel-gazing about ensembles of modeling runs, wind shear, and overwash sediment coring. They are asking for a way to connect something they keep hearing they are supposed to care about to things they already do. The proper response to such questions is not, as the climate hens would have it, to shut them down and turn them away. And it should go without saying that nor is it a reason to overstate the connections between our increasingly heavy influence on the climate and extreme events like Hurricane Sandy. Rather, the appropriate response is to treat the questions for what they are: an invitation to talk about climate change in a way that is meaningful to a curious but decidedly lay public. Climate change means sea levels rising, it means storm surge increases, it means heavier precipitation events (Schaeffer et al., 2012; Sriver et al., 2012; Shepard et al., 2012; Min et al., 2011). If Hurricane Sandy makes these threats more concrete, if it moves them closer in time and space, if- in Roberts’ words- it provides “a set of images, sounds, smells, feelings, experiences”, we should absolutely be talking about it. And perhaps something good will come of this disaster. Clucking from the climate hens be damned.


  • Min, S.-K., X. Zhang, F. W. Zwiers, and G. C. Hegerl (2011), Human contribution to more-intense precipitation extremes, Nature, 470(7334), 378–381, doi:10.1038/nature09763.
  • Schaeffer, M., W. Hare, S. Rahmstorf, and M. Vermeer (2012), Long-term sea-level rise implied by 1.5 °C and 2 °C warming levels, Nature Climate Change, doi:10.1038/nclimate1584.
  • Shepard, C., V. Agostini, B. Gilmer, T. Allen, J. Stone, W. Brooks, and M. Beck (2012), Assessing future risk: quantifying the effects of sea level rise on storm surge risk for the southern shores of Long Island, New York, Natural Hazards, 60(2), 727–745, doi:10.1007/s11069-011-0046-8.
  • Sriver, R., N. Urban, R. Olson, and K. Keller (2012), Toward a physically plausible upper bound of sea-level rise projections, Climatic Change, 1–10, doi:10.1007/s10584-012-0610-6.
  • Weber, E. U. (2010), What shapes perceptions of climate change?, Wiley Interdisciplinary Reviews: Climate Change, 1(3), 332–342, doi:10.1002/wcc.41.

Making an honest hack out of Fred Pearce in five easy steps

Image courtesy of Flickr user “bLOGOS/HA HA”, used under Creative Commons

Attempting to convince those in the grip of denialism is like trying to nail Jell-O to a wall. Take the case of the DDT-holocaust lie. No sooner has one false claim been thrown out (e.g. DDT ban in Malaysia in 1999 resulted in an increase in malaria) and shown to be nonsense than a new claim bearing no particular relation to its predecessor is deployed. Rather than chase down every single mutually contradictory claim made by those perpetuating the lie, I invite them to put themselves on record in a manner that makes their claims easily assessable.

In order to claim, as rubbish journalist Fred Pearce has, that anti-science environmentalism is responsible for “blanket opposition” to DDT use in fighting malaria resulting in a “virtual ban” for “more than three decades” and “millions of deaths”, one only has to satisfy a handful of conditions:

  1. Quantify how many, from where, and over what time interval the “millions of deaths” are supposed to have occurred.
  2. Demonstrate that there was a ban (actual or “virtual”), restriction, or other meaningful impediment to using DDT for malaria control (vs. for example agricultural spraying) in place for all deaths claimed in the above.
  3. Demonstrate that had DDT been implemented, all deaths claimed in the above would have been prevented (taking into consideration obvious confounding factors like the increase in resistance to DDT).
  4. Demonstrate that had DDT been implemented, the overall net result including health, economic, and environmental problems would have been positive- in other words, that using DDT would have resulted in more good than harm.
  5. Demonstrate that the cause of DDT not being implemented in all of the above cases was specifically attributable to “blanket” anti-science environmentalist opposition, rather than science-, economics-, efficacy-, and logistics-based reasons from professional science and health organizations like the World Health Organization, or implementation problems that had nothing to do with Silent Spring (such as replastering and bedbug concerns raised in places like South Africa).

Pretty simple. If you can’t satisfy the conditions, you don’t get to toss corpses at the feet of supposed anti-science environmentalist opposition arising from Silent Spring. Just how serious a case do people like Fred Pearce and Roy Spencer really believe they have?

My guess? Most won’t even  get past the first question or two.

Tom Fuller and Malaria – A Case Study of Denialism and the Backfire Effect

[I’m going to assume that most people who visit this blog are familiar with denialism and its hallmarks. If not, check out a good rundown from Denialism blog.]

Longtime readers are already familiar with Tom Fuller’s denialism on climate, e.g. here and here. Lately, Fuller has decided to throw his lot in with the DDT-holocaust lie.

The meme that anti-science environmentalist hysteria resulted in a ban on DDT use, resulting in millions of deaths from malaria, is fairly prevalent among the fringe American right wing but few places elsewhere. It’s championed by anti-regulatory front groups (e.g. CEI), climate denialists (e.g. Roy Spencer), and more recently rubbish journalist Fred Pearce.

It is of course demonstrably false. Make no mistake, there was indeed a resurgence of malaria after some decades of relative success in suppressing it. This resurgence had nothing to do with anti-science environmentalist hysteria. The reasons for it are not shrouded in mystery, but are rather mundane and (unfortunately for those looking to smear environmentalists) pretty much what a sane person would expect: financial problems, complacency, political instability, growing resistance, cost-benefit tradeoffs with alternatives due to scientific, economic, and practical concerns, and the like (Nájera et al., 2011; Cohen et al., 2012).

This was pointed out to Fuller. But Fuller tends to think with his gut, so he was not about to let pesky little things like reality stand in the way of a good blood libel. So he attempts to marshal some “evidence” in support of Pearce’s use of the lie. His first attempt is to blame the 1972 domestic ban on DDT use in the US- that had explicit exemptions for public health needs such as disease vector control- for a decline in DDT use in Sri Lanka that began in 1964. This is, to put it mildly, rank idiocy. Its nonsensical nature is pointed out.

Unsteadied, Fuller spends the next few comments telling people like myself that we “suck”, we’re on acid, and that environmentalists are like skinheads.

You might think this invective is the dawning of a realization of defeat. But the human psyche is a funny thing. When someone is shown that their position is stupidly, laughably wrong, if the position is tied to their ideological beliefs, it will have some interesting effects. Rather than accept their wrongness, they will actually discount the the refuting evidence and reaffirm their position even more strongly (Nyhan and Reifler, 2010). So after the brief period of insults free of any actual arguments, Fuller goes casting about for something else that will justify the DDT-holocaust lie. And look what happens along the way:

Fuller starts out just trying to justify Pearce’s use of the word “arguably”, and says that, well “[t]here are a substantial number of people who sincerely believe” in the DDT-holocaust lie, so Pearce is okay [October 23rd, 2012 at 12:16 pm]. His attempts to defend Pearce are shown to be wrong and he goes looking for other ones. As he does, he becomes more and more invested in the idea not just that Pearce was okay to spread the lie because he said it was “arguably” true, but that it is in fact absolutely true [October 24th, 2012 at 4:45 pm; October 24th, 2012 at 4:52 pm], and then goes still further and claims Pearce was really understating (!) the case [October 24th, 2012 at 9:28 pm]:

If Pearce is guilty of anything, it appears to be understatement.

This is the backfire effect on full, magnificent display.

And of course, denialism is nothing if not predictable, so Fuller’s evidence included the following: citing a four year hiatus of DDT use in South Africa that actually had nothing to do with anti-science environmentalist hysteria related to Silent Spring and was, it should go without saying, not responsible for “millions of deaths” (Mnzava, 2001; Cliff et al., 2010). Claiming that a 1999 ban on DDT caused an increase in malaria infections in Malaysia- this is what the trend in malaria infection actually is:

Citing the science, economic, and logistics-based decisions of the World Health Organization as anti-science environmentalist hysteria. Copypasta’ing walls of text from Senate testimony-fudger and all-around innumerate DDT evangelist Donald Roberts. And claiming that DDT was “stopped several decades [before the year 2000 in Mozambique], because 80% of the country’s health budget came from donor funds, and donors refused to allow the use of DDT” , despite DDT being the main method of malarial control until 1993. Claiming this, I should add, hours after it was pointed out as a falsehood in response to another commenter.

There is no admission of being wrong about any of things Fuller tossed out that were demonstrably false. There is no attempt made to maintain coherence of evidence or narrative (science and logistics are conflated with anti-science hysteria; the World Bank and WHO are conflated with hippies; the “millions of deaths” are supposed to have taken place in Africa in the 60s, then the 90s, then in the Americas; etc.). Causality is, several times, thrown completely out the window. And the sillier and more contradictory the claims grow, the more convinced Fuller becomes that the DDT-holocast lie is true.

All of this behavior will seem irrational and bizarre to many onlookers. And it is bizarre, if we were really talking about a person who was legitimately interested in looking at the reality of the situation. But of course, that’s not at all what’s taking place. What’s taking place is very classic behavior associated with motivated reasoning. It’s certainly not rational, but it is all too familiar. Though the topic is different, the dynamics are the same with respect to the denial of the reality and seriousness of anthropogenic climate change. Some people are just not going to be reachable by reality-based arguments. Taking a fact-based approach will actually cause some of them to be even more committed to their incorrect beliefs. Fortunately, though, the same social science that has illuminated this irrational behavior offers us some ways to bypass it. Hopefully I will have more to say on that later.

Note: In comments, Fuller says he was not defending Pearce’s use of “arguably”.


  • Cliff, J., S. Lewin, G. Woelk, B. Fernandes, A. Mariano, E. Sevene, K. Daniels, S. Matinhure, A. Oxman, and J. Lavis (2010), Policy development in malaria vector management in Mozambique, South Africa and Zimbabwe, Health Policy Plan, 25(5), 372–383, doi:10.1093/heapol/czq008.
  • Cohen, J., D. Smith, C. Cotter, A. Ward, G. Yamey, O. Sabot, and B. Moonen (2012), Malaria resurgence: a systematic review and assessment of its causes, Malaria Journal, 11(1), 122, doi:10.1186/1475-2875-11-122.
  • Mnzava, A. E., B. L. Sharp, D. J. Mthembu, D. le Sueur, S. S. Dlamini, J. K. Gumede, and I. Kleinschmidt (2001), Malaria control–two years’ use of insecticide-treated bednets compared with insecticide house spraying in KwaZulu-Natal, S. Afr. Med. J., 91(11), 978–983.
  • Nájera, J. A., M. González-Silva, and P. L. Alonso (2011), Some Lessons for the Future from the Global Malaria Eradication Programme (1955–1969), PLoS Med, 8(1), e1000412, doi:10.1371/journal.pmed.1000412.
  • Nyhan, B., and J. Reifler (2010), When Corrections Fail: The Persistence of Political Misperceptions, Political Behavior, 32(2), 303–330, doi:10.1007/s11109-010-9112-2.