Climate Change Disinformation Comes to Pennsylvania


One day in September1997, while serving as Program Manager for United Nations Organizations in the US EPA Office of International Activities, I was sitting at the microphone representing the United States during negotiations of the UN Commission on Sustainable Development when an agenda item arose about whether governments were willing to stipulate that the global warming then already discernible as largely predicted by the peer-reviewed science, was human-caused rather than the result of natural forces. These natural climate drivers include, among others, several cyclical changes in the sun’s energy output that reaches Earth, changes in ocean circulation and chemistry, movement of the Earth’s tectonic plates, and CO2 releases as the result of volcanic activity.

A few OPEC countries led by Saudi Arabia at the start of the negotiation on this matter balked at agreeing to language that concluded that human activities were responsible for the growing climate change threats. Yet when I pointed out that their scientific representatives had agreed to the very same language under discussion in a  meeting of climate scientists the year before, all countries finally agreed to stipulate that the growing global warming was led human-caused. Thus, every country in the world, including the world’s petroleum states which have consistently blocked global action on climate change, agreed more than two decades ago that the ominous climate changes the world has been experiencing are largely caused by rising levels of GHGs in the atmosphere which are attributable to human activities.

The reason for the universal international agreement among nations that humans are responsible for the climate change the world is experiencing is that the evidence of human causation is extraordinarily compelling despite the fact that the Earth has experienced warming and cooling cycles during Earth’s history in responses to natural forces. The confidence of human causation is very high because scientists: (1) can predict how the Earth will warm up differently if a layer of GHGs in the atmosphere warms the Earth compared to how our planet warms if the natural forces that have caused warming in the Earth’s historical heating and cooling cycles, (2) have known precisely since the mid-1880s the amount of energy a molecule of CO2 generates in watts per square meter, (3) have known that the CO2 accumulating in the atmosphere is from fossil fuel combustion because of its chemical isotope, (4) have determined that the CO2 accumulating in the atmosphere is directly proportional to the timing and amount of fossil fuel combustion around the world, (5) tested these lines of evidence  rigorously in computer model experiments since the 1960s.

Climate change is not only a terrifying future problem, it is already causing increasing devastation and human suffering to more and more parts of the world. Just in early March, Cyclone Idai devastated Mozambique, Zimbabwe, and Malawi killing over a 1000 people and displacing hundreds of thousands of others in Mozambique alone. The New York Times described the devastation as follows:

Nearly a week after southern Africa was hit by one of the worst natural disasters in decades, it was all rescue workers could do to try to reach the victims let alone count the dead. People were climbing to trees desperately waiting for some form of rescue. Around them, the remnants of homes sat in piles, collapsed as easily as if they had been houses of cards. Hundreds of thousands of people in Mozambique alone were displaced and everywhere there was a vast inland sea where once there had been land.

The 1.1 0C temperature rise the Earth has experienced since the beginning of the industrial revolution that the mainstream scientific community has attributed to human activities has already caused brutal suffering caused by increases in killer hurricanes, unprecedented flooding, droughts, forest fires, storm surges, climate refugees, increases in vector-borne and tropical diseases, killer heat stresses, loss of valued ecological systems including coral reefs around the world, and human conflict in Syria and parts of Africa.

Because even modest amounts of additional warming create the risk that certain thresholds, or “tipping points,” in the climate system may be exceeded causing much more abrupt climate change, human-induced climate change creates grave threats to life on Earth. These thresholds include ice sheet destabilization, methane leakage stored in permafrost and oceans, loss of the energy reflective properties of sea ice, and changes to the ocean heat circulation system among others. If some of these tipping points are triggered, the increased warming will subject some parts of the world, including many African states, large parts of the middle east, and hundreds of cities near oceans to multiple impacts including crop failures, deadly heat waves, expansion of tropical diseases, flooding, and drought. Thus, future devastation threatened by climate change is horrifying. For this reason, all the nations of the world in 2015 agreed to adopt policies that limited warming to as close as possible to 1.5 0C but no greater than 2.0 0C. Yet limiting the warming to these levels will require all nations and levels of government, including state and local governments, to act with a war-like coordinated effort to decarbonize the global economy.

Despite the universal agreement among nations that climate change is human-caused and very dangerous, the Republican-controlled Pennsylvania House Committee on Environmental Resources and Energy invited Gregory Wrightstone on March 27 to testify on climate change issues. Mr. Wrightstone’s only qualifications to testify as an expert on climate change are bachelors and masters degrees in geology and some published research on geology including the geology of the Marcellus shale. Although Mr. Wrightstone acknowledged that he has never published in the peer-reviewed climate science literature, Mr. Wrightstone took issue with the conclusions of 97% of climate scientists who publish in peer-reviewed climate science literature and who support the consensus view on human causation of climate change and its potential catastrophic impacts to the human race from current climate change trends. The “consensus” view on climate science is also supported by 80 academies of science in the world, including the US Academy of Science, and at least 21 prestigious scientific organizations whose members engage in science relevant to climate change including the American Geophysical Union, the European Geosciences Union, the Geological Sciences of America and London, organizations whose members include geologists, Mr. Wrightstone’s discipline.

The consensus view of mainstream science has often been initially articulated by the Intergovernmental Panel on Climate Change (IPCC), an organization created by the world’s governments and the United Nations at the suggestion of the United States in 1988 to synthesize the peer-reviewed climate change science and make recommendations to the world’s governments on climate change policies. IPCC does not do independent scientific research but approximately every five years examines the peer-reviewed scientific literature and draws conclusions which are further reviewed by climate scientists and approved by the experts from the governments of the world. The IPCC has issued five comprehensive assessments starting with the first assessment report in 1990 and several special reports. The 5th assessment was published in 2014 and was written by 861 climate scientists whose nominations were reviewed to determine whether they had expert qualifications in climate science. (IPCC, 2014)

Mr. Writestone’s testimony began with a statement that he would “undercut the notion that our changing climate is primarily caused by human-caused increases in greenhouse gases and those changes are having negative impacts on Earth’s ecosystems and on humanity.”

Skepticism in science is a good thing, in fact, it is the oxygen that allows science to make contributions to human understanding of how the world works. But skeptics, to be taken seriously, must abide by the rules of science which require that scientific claims be subjected to peer-review. Mr. Wrightstone’s claims about climate change made during the March 31 hearing not only have never been peer-reviewed, but they were also either dramatically inconsistent with peer-reviewed climate change science or were cherry-picked facts that although true on their face do not undermine the conclusions of peer-reviewed science. “Cherry-picking” means picking from possible facts only those facts that support a predetermined conclusion while ignoring other facts.  Examples of Mr. Wrightstone’s cherry-picked arguments made in his testimony to undermine the scientific consensus view that human activities were responsible for raising atmospheric CO2 to dangerous levels included that:

  • The current concentration of CO2 is very low compared to other levels in the historical record, ignoring the strong scientific consensus that current elevated CO2 levels are a human-caused and global catastrophe is likely unless there is an unprecedented international effort to rapidly reduce GHG emissions;
  • Earth’s ecosystems thrived when CO2 levels were much higher, ignoring the fact that when atmospheric CO2 levels got high enough, the resulting warming tripped dangerous positive feedbacks which led to abrupt warming increases that several times caused mass extinctions of much of life on Earth and mainstream scientists believe that the current rise in global temperatures is approaching levels which may trigger several of these positive feedback triggers which could cause abrupt very dangerous levels of warming;
  • CO2 is good because it promotes plant growth and prevents the Earth from getting too cold, ignoring the huge scientific literature that has identified enormous human suffering and damages that current levels of warming have already caused particularly harming the world’s poorest people and the potential to cause abrupt climate change which could cause mass extinction;
  • Current concentrations of CO2 are not unprecedented if one looks at the full history of the Earth’s atmosphere rather than the time span usually considered, ignoring the scientific evidence that that high CO2 levels in the Earth’s history were sometimes responsible for causing mass extinctions and conditions such as sea level rise which would now cause hard-to-imagine destruction especially to hundreds of the Earth’s most populated cities small island states, and poorest people and countries.

Several sociologists, including Dr. Robert Bruelle from Drexel University and  Riley Dunlap from Oklahoma State, among others, in many peer-reviewed sociological papers and in a recent book (Dunlap and McCright, 2015), have documented how some fossil fuel companies or their industrial organizations such as the American Petroleum Institute, and free market fundamentalists foundations and think tanks have funded and supported efforts to undermine the public’s faith in the consensus view of climate science similar to the way the Tobacco Industry supported disinformation about the health threats of smoking tobacco. One of the tools in this effort has been to financially support or publicize the claims of climate skeptics whose claims frequently have not been subjected to peer review.

Mr. Wrightsone’s claims, like many of the arguments made by climate skeptics supported by the fossil fuel industry, not only have not been subjected to peer-review, they were dramatically inconsistent with the large body of peer-reviewed scientific evidence.

I have no evidence that Mr.Wrightstone’s testimony was orchestrated by any members of the Pennsylvania fossil fuel industry or politicians that frequently represent their interests, however, his testimony was similar to the problematic claims of the skeptics supported by the fossil fuel industry organized climate science disinformation campaign.

Mr. Wrightstone also took issue with the frequent claim that the consensus climate science is supported by 97% of climate scientists by stating he was one of the 97% while ignoring that the full claim is that 97% of scientists who engage in “peer-reviewed” climate change science, a group he does not belong to, support the consensus view along with every academy of science in the world, including the US Academy of Science.

Mr.Wrightstone’s testimony included arguments against two proposals under consideration in Pennsylvania that would lower GHG emissions from the state. One, a petition before the Pennsylvania Environmental Hearing Board to establish a Pennsylvania cap and trade program similar to programs in other states. The second proposal is known as the Transportation and Climate Initiative which is a proposed multi-state cooperative program to reduce greenhouse gas emissions from the transportation sector.

His argument against these two programs was that the Governor and the House Committee should make recommendations on these two programs that were based on scientific facts, not on a politically driven narrative of coming planetary gloom. Yet the “facts” of science are established in constant testing through peer-review.

On May 1, the Senate Majority Policy Committee held a hearing about climate change at which Mr; Wrightstone along with climate change deniers David Legates (The Heartland Institute) and Joe Bastardi (WeatherBELL Analytics/frequent FOX News contributor) also testified making arguments that disagreed with the  enormous peer-reviewed science which has been synthesized by 861 climate scientists in the Intergovernmental Panel on Climate Change’s  and agreed to by every government in the world and every Academy of Science in the world. The testimony of all three of these skeptics took issue with elements of the scientific consensus view agreed to by every country in the world and their Academies of Science.

We have written extensively on this site under the category “disinformation” in the above index about why the fossil fuel disinformation campaign is some new heinous crime against humanity. (see index above under “disinformation”) Also see D. Brown, Is climate science disinformation a crime against humanity?

Yet, because the Pennsylvania state government  has done little so far to adopt aggressive climate change policies, but Pennsylvania Governor Wolf has announced his intention to begin to adopt Pennsylvania climate change policies that will significantly reduce Pennsylvania’s GHG emissions, the legislative hearings discussed in this article which have been devoted to publicizing the views of climate skeptics who have not published the claims made in the hearings in peer-review journals are likely only the beginning of more intense efforts to undermine the public’s confidence in mainstream climate science.

Pennsylvania is the third largest emitter of GHGs among US states, behind only Texas and California. The Keystone state is responsible for 1 percent of global emissions yet has only 0.19 percent of the global population.

The Pennsylvania legislature and the Wolf administration have thus far failed to enact policies that will prevent activities in Pennsylvania from causing harsh climate impacts here and to hundreds of millions of the most vulnerable people around the world.  Although Governor Wolf in January took the welcome step of issuing Pennsylvania’s first executive order on climate change which included a goal of reducing GHGs by 26 percent reduction by 2025 and an 80 percent reduction by 2050, from 2005 levels, these targets are woefully short of Pennsylvania’s fair share of needed global action to achieve the 2015 Paris Agreement’s goal of limiting warming as close as possible to 1.5 0C and no greater than 2.0 o C and nothing has yet been done to decarbonize the Pennsylvania economy as required of the world to by the Paris Agreement.

IPCC said in an October special report that to limit warming to 1.5 0C, total global CO2 emissions would need to fall by 45 percent from 2010 levels by 2030, reaching ‘net zero by 2050.  (IPCC, 2018) If Governor Wolf takes climate change seriously, it is very likely that members of the fossil fuel industry in Pennsylvania will try and undermine Pennsylvania citizens’ support for the consensus climate science position by among other tactics making arguments similar to those made by Mr. Wrightstone.


Brown, D. (2010) Is climate science disinformation a crime against humanity? The  Guardian,

Dunlap, R., and McCright, A., (2015) Challenging Climate Change, The Denial Countermovement in Dunlap, R., and Brulle, R. (eds.) (2015). Climate Change and Society, Sociological Perspectives, New York, Oxford University Press

Intergovernmental Panel on Climate Change, (IPCC) AR5 (2014),

Intergovernmental Panel on Climate Change, (IPCC) (2018),



Donald A. Brown

Scholar in Residence and Professor

Sustainability Ethics and Law

Widener University Commonwealth Law School



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s