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Nuccitelli, D., Way, R., Painting, R., Church, J., & Cook, J. (2012). Comment on ocean heat content and Earth's radiation imbalance. II. Relation to climate shifts. Physics Letters A.
Cook, J., Nuccitelli, D., Green, S.A., Richardson, M., Winkler, B., Painting, R., Way, R., Jacobs, P., & Skuce, A. (2013). Quantifying the consensus on anthropogenic global warming in the scientific literature. Environmental Research Letters, 8(2), 024024+.
Nuccitelli, D. et al. (2014). Comment on "Cosmic-ray-driven reaction and greenhouse effect of halogenated molecules: Culprits for atmospheric ozone depletion and global climate change". International Journal of Modern Physics B.
Cook, J., Nuccitelli, D., Skuce, A., Way, R., Jacobs, P., Painting, R., Honeycutt, R., Green, S.A. (2014). Reply to Comment on ‘Quantifying the consensus on anthropogenic global warming in the scientific literature: a Reanalysis’. Energy Policy. DOI: 10.1016/j.enpol.2014.06.002
Nuccitelli, D. A., Abraham, J. P., Benestad, R. E., & Mandia, S. A. (2013). Comment on: Akasofu, S.-I. On the Present Halting of Global Warming. Climate 2013, 1, 4–11. Climate, 1(2), 76-83.
Abraham, J., Cook, J., Fasullo, J., Jacobs, P., Mandia, S., & Nuccitelli, D. (2014). Review of the consensus and asymmetric quality of research on human-induced climate change. Cosmopolis, 2014(1), 3-18.
Benestad, R. E., Hygen, H. O., Dorland, R. V., Cook, J., & Nuccitelli, D. (2013). Agnotology: learning from mistakes. Earth System Dynamics Discussions, 4(1), 451-505.
Nuccitelli, D., Richter, M. J., & McCall, B. J. (2005). A search for interstellar carbon-60. In IAU Symposium (Vol. 235, p. 236P).
Encrenaz, T., Bézard, B., Greathouse, T., Holmes, S., Richter, M., Nuccitelli, D., & Forget, F. et al. (2006, February). Ground-based high-resolution IR spectroscopy of Mars: H2O and H2O2 mapping, search for CH4, and determination of CO2 isotopic ratios. In Second Workshop on Mars Atmosphere Modelling and Observations, held February.
Recent blog posts
Posted on 28 July 2015 by dana1981 &
Cherry-picking is one of the five telltale techniques of climate change denial. By focusing on short-term blips in noisy data, those who want to maintain the status quo can distract from the long-term threats posed by climate change. Climate contrarians most frequently deploy this strategy using global temperature and Arctic sea ice data.
A recent study in Nature Geoscience concluded that, not surprisingly, there is a strong relationship between the summer temperatures in the Arctic (specifically the number of “melting degree days”), and the amount of sea ice that melts in a given year. 2013 happened to be a relatively cool year in the Arctic – the coolest since 2004. As a result, there was relatively little ice melt in 2013. The annual minimum Arctic sea ice extent and volume were their largest since at least 2009, or perhaps as far back as 2005, according to the data used in this new study.
The following figure from the paper is as clear as ice – while there was a short-term increase from 2012 to 2013, the Arctic has lost more than half its sea ice over the past three decades.
The following video by programmer Andy Lee Robinson also illustrates the dramatic rate of sea ice decline over the past 35 years.
Posted on 22 July 2015 by dana1981 &
At the end of this year there will be a critically important international climate change conference in Paris. At this conference, nations will attempt to reach an agreement to reduce greenhouse gas emissions and slow global warming.
Over the past few months there’s been a flood of big climate-related news, most of which will help build support and pressure for a strong agreement to curb global warming at the Paris conference. The political and social climate is shifting, and those in denial about human-caused climate change are struggling to adapt.
Scientific research underscores climate risks
John Abraham recently reported on two separate studies published in Nature andNature Climate Change, both of which found that global warming is intensifying several types of extreme weather. California is in the midst of a drought unprecedented in over a millennium, a heat wave is killing thousands of people in India and Pakistan, another has been baking Europe, and it seems as though half of North America is on fire.
Posted on 16 July 2015 by dana1981 &
Some zombie myths just won’t die. In fact, I debunked this one two years ago at The Guardian.
To sum up, a number of scientific studies have asked the question, ‘if the sun were to enter another extended quiet phase (a grand solar minimum), how would that impact global surface temperatures?’. Every study agrees, it would cause no more than 0.3°C cooling, which would only be enough to temporarily offset about a decade’s worth of human-caused global warming.
Solar activity is actually quite stable. That’s a good thing for us on Earth, because without big swings in the amount of energy reaching the planet from the sun, our climate is likewise generally quite stable. That’s allowed us to build big immobile cities and farms, with the confidence that the climate and weather will be pretty consistent in those areas. It’s allowed human civilization to develop over the past 10,000 years. Though with human-caused global warming in the process of destabilizing the climate, we’re putting that civilization under serious stress.
Posted on 8 July 2015 by dana1981 &
A new study has examined the comments on climate science-denying blogs and found strong evidence of widespread conspiratorial thinking. The study looks at the comments made in response to a previous paper linking science denial and conspiracy theories.
Motivated rejection of science
Three years ago, social scientists Lewandowsky, Oberauer, and Gignac published a paper in the journal Psychological Science titled NASA Faked the Moon Landing—Therefore, (Climate) Science Is a Hoax: An Anatomy of the Motivated Rejection of Science.
The paper detailed the evidence the scientists found that, using survey data provided by visitors to climate blogs, those exhibiting conspiratorial thinking are more likely to be skeptical of scientists’ conclusions about vaccinations, genetically modified foods, and climate change. This result was replicated in a follow-up study using a representative U.S. sample that obtained the same resultlinking conspiratorial thinking to climate denial.
Of course science denial and conspiracies go hand in hand
This shouldn’t be a terribly shocking result. When confronted with inconvenient science, those in denial often reject the evidence by accusing the experts of fraud or conspiracies. We saw a perfect example of this behavior just a few weeks ago. When scientists at NOAA published a paper finding that there was no ‘pause’ in global warming, one of the most common responses from those in denial involved the conspiratorial accusation that the scientists had somehow fudged the data at the behest of the Obama administration.
Posted on 2 July 2015 by dana1981 &
A new paper just published in Science summarizes the projected impacts of climate change on the world’s oceans, and consequently on humans and our economy. The study concludes that global warming beyond the international limit of 2°C above pre-industrial temperatures would pose serious threats to marine ecosystems and their millions of human dependents. It builds on the consensus science published by the Intergovernmental Panel on Climate Change last year. The study concludes,
Posted on 17 June 2015 by dana1981 &
Dan Lunt is a climate scientist at the University of Bristol, and also a tremendous fan of J. R. R. Tolkien’s books. He was able to stitch together enough information to create a model of the fictional world of Middle Earth and simulate its climate.
As part of the Denial101x course, John Cook interviewed Lunt and discussed the process of simulating the climate of Middle Earth. The interview revealed some interesting tidbits. For example, as discussed in Part 2 below, parts of New Zealand, near where the movie was filmed, have a similar climate to that of The Shire. Los Angeles and Alice Springs, Australia share a climate similar to that of Mordor.
I also inquired whether Lunt might consider simulating the climate in the fictional world of Game of Thrones.
Posted on 8 June 2015 by dana1981 &
Last week, a paper out of NOAA concluded that contrary to the popular myth, there’s been no pause in global warming. The study made headlines across the world, including widely-read Guardian stories by John Abraham and Karl Mathiesen. In fact, there may have been information overload associated with the paper, but the key points are relatively straightforward and important.
1. Rapid Global Warming Continues
Arguments about short-term temperature changes only deal with the Earth’s surface temperatures, which account for just 1–2% of the overall warming of the planet. More than 90% of that heat goes into the oceans, and as my colleagues and I noted in a paper published 3 years ago, if anything that warming is accelerating, building up heat at a rate faster than 4 atomic bomb detonations per second.
If you carefully cherry pick start and end dates, you can find a period around 1998–2012 during which the warming of surface temperatures slowed a bit due to temporary natural cooling factors (like more La Niñas), just like it sped up a bit during the 1990s due to temporary natural warming factors (like more El Niños). But these are just wiggles on top of the long-term human-caused global warming trend. As Michael Mann put it,
2. The Surface Warming Slowdown is Probably Over
This is a tough pill to swallow for those who have misused the short-term slowdown in global surface warming to argue against climate policies, but it’s likely over. 2014 was the hottest year on record, and 2015 looks likely to break the record again.
Posted on 3 June 2015 by dana1981 &
A new paper just published in Science Bulletin by Mark Richardson, Zeke Hausfather, Dana Nuccitelli, Ken Rice, and John Abraham shows that mainstream climate models simulate global temperature observations much better than the “irreducibly simple climate model” of Christopher Monckton, Willie Soon, David Legates, and William Briggs.
When the Monckton paper was published in the Chinese journal Science Bulletinthis January, it was covered by conservative media outlets like the Daily Mail,Breitbart and World Net Daily, which used it to manufacture doubt about the dangers associated with human-caused global warming. The ideologically-appealing but scientifically incorrect message from the paper was essentially, ‘climate models are running hot, the climate is insensitive to the increasing greenhouse effect, and thus future global warming will be minimal and nothing to worry about.’
However, our team identified numerous glaring fundamental errors in the Monckton paper. The first was in the very premise of the paper itself, claiming that global climate models are “running hot.” In reality, as I show in my bookClimatology versus Pseudoscience, mainstream climate models have done a good job at projecting the observed changes in the global surface temperature.
While temperature measurements have been toward the lower of the range of model projections in recent years, there’s been a tremendous body of scientific research investigating the various contributors to the slowdown in global surface warming. This research, which was entirely ignored by Monckton and his colleagues, is summarized by Kevin Cowtan in week 5 of the Denial101x course.
Posted on 27 May 2015 by dana1981 &
Unfortunately, denial of human-caused global warming may be a prerequisite for any viable Republican presidential candidate. Conservative and Tea Party Republicans are the one group of American voters among whom Stage 2 climate denial is the majority position, but they’re also the group that most reliably votes in GOP primary elections.
In American politics, a candidate first has to win a primary election before reaching the national ballot. For Republicans, that means appealing to conservatives. It’s not clear that a Republican presidential candidate can accept climate science and run a viable primary campaign.
Nevertheless, the scientific evidence supporting human-caused global warming is just as strong as the evidence linking smoking and lung cancer. Last year, the IPCC stated with 95% confidence that humans are the main cause of the global warming that’s occurred since 1950. Their best estimate is that we’re responsible for about 100% of the warming during the past six decades.
Gavin Schmidt, Director of the NASA Goddard Institute for Space Studies, put together this graph showing what’s known as the probability density function of the human contribution to global warming since 1950, based on the IPCC report.
Posted on 21 May 2015 by dana1981 &
US Congress periodically holds hearings on issues related to climate change. Because the subject has become a partisan one in America, they generally follow a predictable pattern – Democrats invite science and policy expert witnesses who agree with the expert consensus on human-caused global warming and the need to address it, and Republicans invite witnesses who disagree.
John Christy at the University of Alabama at Huntsville is one of the fewer than 3% of climate scientists who publishes research suggesting that humans aren’t the primary cause of the current global warming. He’s thus become one of Republicans’ favorite expert witnesses.
Last week, the Committee on Natural Resources held a hearing to discuss draft guidance by the the President’s Council on Environmental Quality to include carbon pollution and the effects of climate change in the consideration of environmental impacts of federal projects, as part of the National Environmental Policy Act (NEPA) review process. Needless to say, the Republicans on the committee don’t like the idea, as is clear from the hearing highlights and lowlights in the video below.
Christy Manufactures Doubt on Model Accuracy
Given that the hearing was ostensibly about environmental policy, most of the witnesses were policy experts. John Christy was the lone climate scientist invited to testify. His testimony focused on manufacturing doubt about the accuracy of climate models, climate change impacts, and about individual American projects’ contributions to global warming. On the accuracy of climate models, Christy played rather fast and loose with the facts, saying in his written testimony (emphasis added),
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