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Hyperbolic Scenarios, Crude Climate Models, and Scientism

07 Sunday Nov 2021

Posted by Nuetzel in Climate science, Global Warming

≈ 6 Comments

Tags

Carbon Efficiency, Carbon forcing, carbon Sensitivity, Cloud Feedback, COP26, G20, Global Temprature, IEA, Intergovernmental Panel on Climate Change, International Energy Agency, IPCC, Joe Biden, Joe Brandon, Judith Curry, Justin Ritchie, Net Zero Emissions, Nic Lewis, Precautionary Principle, Prince Charles, RCP8.5, rent seeking, Representative Concentration Pathway, Roger Pielke Jr., Scientism, United Nations

What we hear regarding the dangers of climate change is based on predictions of future atmospheric carbon concentrations and corresponding predictions of global temperatures. Those predictions are not “data” in the normal, positive sense. They do not represent “the way things are” or “the way things have been”, though one might hope the initial model conditions align with reality. Nor can the predictions be relied upon as “the way things will be”. Climate scientists normally report a range of outcomes produced by models, yet we usually hear only one type of consequence for humanity: catastrophe!

Models Are Not Reality

The kinds of climate models quoted by activists and by the UN’s Intergovernmental Panel on Climate Change (IPCC) have been around for decades. Known as “carbon forcing” models, they are highly simplified representations of the process determining global temperatures. The primary forecast inputs are atmospheric carbon concentrations over time, which again are themselves predictions.

It’s usually asserted that climate model outputs should guide policy, but we must ask: how much confidence can we have in the predictions to allow government to take coercive actions having immediate, negative impacts on human well being? What evidence can be marshaled to show prospective outcomes under proposed policies? And how well do these models fit the actual, historical data? That is, how well do model predictions track our historical experience, given the historical paths of inputs like carbon concentrations?

Faulty Inputs

The IPCC has been defining and updating sets of carbon scenarios since 1990. The scenarios outline the future paths of greenhouse gas emissions (and carbon forcings). They were originally based on economic and demographic modeling before an apparent “decision by committee” to maintain consistency with scenarios issued in the past. Roger Pielke Jr. and Justin Ritchie describe the evolution of this decision process, and they call for change:

“Our research (and that of several colleagues) indicates that the scenarios of greenhouse gas (GHG) emissions through the end of the twenty-first century are grounded in outdated portrayals of the recent past. Because climate models depend on these scenarios to project the future behavior of the climate, the outdated scenarios provide a misleading basis both for developing a scientific evidence base and for informing climate policy discussions. The continuing misuse of scenarios in climate research has become pervasive and consequential—so much so that we view it as one of the most significant failures of scientific integrity in the twenty-first century thus far. We need a course correction.”

One would certainly expect the predicted growth of atmospheric carbon to evolve over time. However, as Pielke and Ritchie note, the IPCC’s baseline carbon scenario today, known as RCP8.5 (“Representative Concentration Pathway”), is remarkably similar to the “business as usual” (BAU) scenario it first issued in 1990:

“The emissions scenarios the climate community is now using as baselines for climate models depend on portrayals of the present that are no longer true. And once the scenarios lost touch with reality, so did the climate, impact, and economic models that depend on them for their projections of the future. Yet these projections are a central part of the scientific basis upon which climate policymakers are now developing, debating, and adopting policies.”

The authors go on to discuss a few characteristics of the BAU scenario that today seem implausible, including:

“… RCP8.5 foresees carbon dioxide emissions growing rapidly to at least the year 2300 when Earth reaches more than 2,000 ppm of atmospheric carbon dioxide concentrations. But again, according to the IEA and other groups, fossil energy emissions have likely plateaued, and it is plausible to achieve net-zero emissions before the end of the century, if not much sooner.”

Pielke and Ritchie demonstrate that the IPCC’s baseline range of carbon emissions by 2045 is centered well above (actually double) the mid-range of scenarios developed by the International Energy Agency (IEA), and there is very little overlap between the two. However, global carbon emissions have been flat over the past decade. Even if we extrapolate the growth in atmospheric CO2 parts per million over the past 20 years, it would rise to less than 600 ppm by 2100, not 1,200 ppm. It’s true that a few countries (China comes to mind) continue to exploit less “carbon efficient” energy resources like coal, but the growth trend in concentrations is likely to continue to taper over time.

It therefore appears that the IPCC’s climate scenarios, which are used broadly as model inputs by the climate research community, are suspect. As one might suspect: garbage in, garbage out. But what about the climate models themselves?

Faulty Models

The model temperature predictions have been grossly in error. They have been and continue to be “too hot”. The chart at the top of this post is typical of the comparisons of model projections and actual temperatures. Before the year 2000, most of the temperature paths projected by the particular model charted above ran higher than actual temperatures. However, the trends subsequently diverged and the gap has become more extreme over the past two decades.

The problem is not merely one of faulty inputs. The models themselves are deeply flawed, as they fail to account adequately for natural forces that strongly influence our climate. It’s been clear for many years that the sun’s radiative energy has a massive impact on temperatures, and it is affected not only by the intensity of the solar cycle but also by cloud cover on Earth. Unfortunately, carbon forcing models do not agree on the role that increased clouds might have in amplifying warming. However, a reduction in cloud cover over the past 20 years, and a corresponding increase in radiative heat, can account for every bit of the warming experienced over that time.

This finding not only offers an alternative explanation for two decades of modest warming, it also strikes at the very heart of the presumed feedback mechanism usually assumed to amplify carbon-induced warming. The overall effect is summarized by the so-called carbon sensitivity, measured as the response of global temperature to a doubling of carbon concentration. The IPCC puts that sensitivity in a range of 1.5C to 4.5C. However, findings published by Nic Lewis and Judith Curry are close to the low end of that range, as are those found by Frank Bosse reported here. The uncertainties surrounding the role of cloud cover and carbon sensitivities reveal that the outputs relied upon by climate alarmists are extreme model simulations, not the kind of reliable intelligence upon which drastic policy measures should be taken.

The constant anxiety issued from the Left on the issue of climate change, and not a little haranguing of the rest of us, is misplaced. The IPCC’s scenarios for the future paths of carbon concentration are outdated and seriously exaggerated, and they represent a breach of scientific protocol. Yet the scenarios are widely used as the basis of policy discussions at both the domestic and international levels. The climate models themselves embed questionable assumptions that create a bias toward calamitous outcomes.

Yet Drastic Action Is Urged

The UN’s 2021 climate conference, or COP26 (“Conference of the Parties …”) is taking place in Glasgow, Scotland this month. Like earlier international climate conferences, the hope is that dire forecasts will prompt broad agreement on goals and commitments, and that signatory countries will translate these into policy at the national level.

Things got off to a bad start when, before COP26 even began, the G20 nations failed to agree on a goal of “net-zero” carbon emissions by 2050. Another bad portent for the conference is that China and India, both big carbon emitters, will not attend, which must be tremendously disappointing to attendees. After all, COP26 has been billed by Prince Charles himself as “the last chance saloon, literally”, for saving the world from catastrophe. He said roughly the same thing before the Paris conference in 2014. And Joe Brandon … er, Biden, blurted some hyperbole of his own:

“Climate change is already ravaging the world. … It’s destroying people’s lives and livelihoods and doing it every single day. … It’s costing our nations trillions of dollars.”

All this is unadulterated hogwash. But it is the stuff upon which a crisis-hungry media feeds. This hucksterism is but one form of climate rent-seeking. Other forms are much more troubling: scary scenarios and model predictions serve the self-interest of regulators, grant-seeking researchers, interventionist politicians, and green investors who suckle at the public teat. It is a nightmare of scientism fed by the arrogance of self-interested social planners. The renewable energy technologies promoted by these investors, politicians, and planners are costly and land-intensive, providing only intermittent output (requiring backup fossil fuel capacity), and they have nasty environmental consequences of their own.

The precautionary principle is no excuse for the extreme policies advocated by alarmists. We already have economically viable “carbon efficient” and even zero-carbon energy alternatives, such as natural gas, modular nuclear power, and expanded opportunities for exploiting geothermal energy. This argues against premature deployment of wasteful renewables. The real crisis is the threat posed by the imposition of draconian green policies to our long-term prosperity, and especially to the world’s poor.

The Futility and Falsehoods of Climate Heroics

01 Tuesday Jun 2021

Posted by Nuetzel in Climate science, Environmental Fascism, Global Warming, Uncategorized

≈ Leave a comment

Tags

Atmospheric Carbon, Biden Administration, Carbon forcing, Carbon Mitigation, Climate Change, Climate Sensitivity, ExxonMobil, Fossil fuels, global warming, Green Energy, Greenhouse Gas, IPPC, John Kerry, Judith Curry, Natural Gas, Netherlands Climate Act, Nic Lewis, Nuclear power, Putty-Clay Technology, Renewables, Ross McKitrick, Royal Dutch Shell, Social Cost of Carbon, William Nordhaus

The world’s gone far astray in attempts to battle climate change through forced reductions in carbon emissions. Last Wednesday, in an outrageously stupid ruling,a Dutch court ordered Royal Dutch Shell to reduce its emissions by 45% by 2030 relative to 2019 levels. It has nothing to do with Shell’s historical record on the environment. Rather, the Court said Shell’s existing climate action plans did not meet “the company’s own responsibility for achieving a CO2 reduction.” The decision will be appealed, but it appears that “industry agreements” under the Netherlands’ Climate Act of 2019 are in dispute.

Later that same day, a shareholder dissident group supporting corporate action on climate change won at least two ExxonMobil board seats. And then we have the story of John Kerry’s effort to stop major banks from lending to the fossil fuel industry. Together with the Biden Administration’s other actions on energy policy, we are witnessing the greatest attack on conventional power sources in history, and we’ll all pay dearly for it. 

The Central Planner’s Conceit

Technological advance is a great thing, and we’ve seen it in the development of safe nuclear power generation, but the environmental left has successfully placed roadblocks in the way of its deployment. Instead, they favor the mandated adoption of what amount to beta versions of technologies that might never be economic and create extreme environmental hazards of their own (see here, here, here, and here). To private adopters, green energy installations are often subsidized by the government, disguising their underlying inefficiencies. These premature beta versions are then embedded in our base of productive capital and often remain even as they are made obsolete by subsequent advances. The “putty-clay” nature of technology decisions should caution us against premature adoptions of this kind. This is just one of the many curses of central planning.

Not only have our leftist planners forced the deployment of inferior technologies: they are actively seeking to bring more viable alternatives to ruination. I mentioned nuclear power and even natural gas offer a path for reducing carbon emissions, yet climate alarmists wage war against it as much as other fossil fuels. We have Kerry’s plot to deny funding for the fossil fuel industry and even activist “woke” investors, attempting to override management expertise and divert internal resources to green energy. It’s not as if renewable energy sources are not already part of these energy firms’ development portfolios. Allocations of capital and staff to these projects are usually dependent upon a company’s professional and technical expertise, market forces, and (less propitiously) incentives decreed by the government. Yet, the activist investors are there to impose their will.

Placing Faith and Fate In Models

All these attempts to remake our energy complex and the economy are based on the presumed external costs associated with carbon emissions. Those costs, and the potential savings achievable through the mitigation efforts of government and private greenies around the globe, have been wildly exaggerated.

The first thing to understand about the climate “science” relied upon by the environmental left is that it is almost exclusively model-dependent. In other words, it is based on mathematical relationships specified by the researchers. Their projections depend on those specs, the selection of parameter values, and the scenarios to which they are subjected. The models are usually calibrated to be roughly consistent with outcomes over some historical time period, but as modelers in almost any field can attest, that is not hard to do. It’s still possible to produce extreme results out-of-sample. The point is that these models are generally not estimated statistically from a lengthy sample of historical data. Even when sound statistical methodologies are employed, the samples are blinkingly short on climatological timescales. That means they are highly sample-specific and likely to propagate large errors out-of-sample. But most of these are what might be called “toy models” specified by the researcher. And what are often billed as “findings” are merely projections based on scenarios that are themselves manufactured by imaginative climate “researchers” cum grant-seeking partisans. In fact, it’s much worse than that because even historical climate data is subject to manipulation, but that’s a topic for another day.

Key Assumptions

What follows are basic components of the climate apocalypse narrative as supported by “the science” of man-made or anthropomorphic global warming (AGW):

(A) The first kind of model output to consider is the increase in atmospheric carbon concentration over time, measured in parts per million (PPM). This is a function of many natural processes, including volcanism and other kinds of outgassing from oceans and decomposing biomass, as well absorption by carbon sinks like vegetation and various geological materials. But the primary focus is human carbon generating activity, which depends on the carbon-intensity of production technology. As Ross McKitrick shows (see chart below), projections from these kinds of models have demonstrated significant upside bias over the years. Whether that is because of slower than expected economic growth, unexpected technological efficiencies, an increase in the service-orientation of economic activity worldwide, or feedback from carbon-induced greening or other processes, most of the models have over-predicted atmospheric carbon PPM. Those errors tend to increase with the passage of time, of course.

(B) Most of the models promoted by climate alarmists are carbon forcing models, meaning that carbon emissions are the primary driver of global temperatures and other phenomena like storm strength and increases in sea level. With increases in carbon concentration predicted by the models in (A) above, the next stage of models predicts that temperatures must rise. But the models tend to run “hot.” This chart shows the mean of several prominent global temperature series contrasted with 1990 projections from the Intergovernmental Panel on Climate Change (IPCC).

The following is even more revealing, as it shows the dispersion of various model runs relative to three different global temperature series:

And here’s another, which is a more “stylized” view, showing ranges of predictions. The gaps show errors of fairly large magnitude relative to the mean trend of actual temperatures of 0.11 degrees Celsius per decade.

(C) Climate sensitivity to “radiative forcing” is a key assumption underlying all of the forecasts of AGW. A simple explanation is that a stronger greenhouse effect, and increases in the atmosphere’s carbon concentration, cause more solar energy to be “trapped” within our “greenhouse,” and less is radiated back into space. Climate sensitivity is usually measured in degrees Celsius relative to a doubling of atmospheric carbon. 

And how large is the climate’s sensitivity to a doubling of carbon PPM? The IPCC says it’s in a range of 1.5C to 4.5C. However, findings published by Nic Lewis and Judith Curry are close to the low end of that range, and are those found by the author of the paper described here. 

In separate efforts, Finnish and Japanese researchers have asserted that the primary cause of recent warming is an increase in low cloud cover, which the Japanese team attributes to increases in the Earth’s bombardment by cosmic rays due to a weakening magnetic field. The Finnish authors note that most of the models used by the climate establishment ignore cloud formation, an omission they believe leads to a massive overstatement (10x) of sensitivity to carbon forcings. Furthermore, they assert that carbon forcings are mainly attributable to ocean discharge as opposed to human activity.

(D) Estimates of the Social Cost of Carbon (SCC) per ton of emissions are used as a rationale for carbon abatement efforts. The SCC was pioneered by economist William Nordhaus in the 1990s, and today there are a number of prominent models that produce distributions of possible SCC values, which tend to have high dispersion and extremely long upper tails. Of course, the highest estimates are driven by the same assumptions about extreme climate sensitivities discussed above. The Biden Administration is using an SCC of $51 per ton. Some recommend the adoption of even higher values for regulatory purposes in order to achieve net-zero emissions at an early date, revealing the manipulative purposes to which the SCC concept is put. This is a raw attempt to usurp economic power, not any sort of exercise in optimization, as this admission from a “climate expert” shows. In the midst of a barrage of false climate propaganda (hurricanes! wildfires!), he tells 60 Minutes that an acceptable limit on warming of 1.5C is just a number they “chose” as a “tipping point.”

As a measurement exercise, more realistic climate sensitivities yield much lower SCCs. McKitrick presents a chart from Lewis-Curry comparing their estimates of the SCC at lower climate sensitivities to an average of earlier estimates used by IPCC:

High levels of the SCC are used as a rationale for high-cost carbon abatement efforts. If the SCC is overstated, however, then costly abatements represent waste. And there is no guarantee that spending an amount on abatements equal to the SCC will eliminate the presumed cost of a ton’s worth of anthropomorphic warming. Again, there are strong reasons to believe that the warming experienced over the past several decades has had multiple causes, and human carbon emissions might have played a relatively minor role. 

Crisis Is King

Some people just aren’t happy unless they have a crisis over which to harangue the rest of us. But try as they might, the vast resources dedicated to carbon reduction are largely wasted. I hesitate to say their effort is quixotic because they want more windmills and are completely lacking in gallantry. As McKitrick notes, it takes many years for abatement to have a meaningful impact on carbon concentrations, and since emissions mix globally, unilateral efforts are practically worthless. Worse yet, the resource costs of abatement and lost economic growth are unacceptable, especially when some of the most promising alternative sources of “clean” energy are dismissed by activists. So we forego economic growth, rush to adopt immature energy alternatives, and make very little progress toward the stated goals of the climate alarmists.

Would You Tax Coastal Development?

14 Monday Dec 2015

Posted by Nuetzel in Central Planning, Global Warming

≈ Leave a comment

Tags

Carbon forcing, central planning, Climate Alarmism, Climate Change, Coastal development, Coastal tax, Federal Flood Insurance, FEMA, Glacier Melts, Glenn Reynolds, Pigouvian subsidies, Pigouvian Taxes, Robin Hanson, Sea Ice Extent, Strait of Gibraltar, Subsidies, Taxing development

Sea Level

If sea levels are truly rising due to climate change, then public policy should stop encouraging new development in coastal areas. Stipulating that this threat is real for the moment, serious and damaging encroachment of the seas might be 50 years away or more. By that time, many of today’s coastal buildings will be gone, or at least candidates for replacement, under realistic assumptions about the average lives of structures. A relatively low-cost approach to the threat of rising seas would be to stop building along the most vulnerable coasts right now and move new development inland. Yet no one wants to do that, least of all coastal property owners. But there is little discussion of this alternative even among the true believers of a coming global warming apocalypse. Why not?

This and related questions have been asked recently by several writers, including Glenn Reynolds and economist Robin Hanson. There are alternatives to discouraging new construction along coasts. Other expensive abatement projects can be pursued, now and later, such as sea walls or even adding land mass excavated from the sea floor or inland. In fact, the prospect of damming the Strait of Gibraltar to protect Mediterranean coastlines has been discussed. The expense of such an unprecedented public works project is what prompted Hanson’s post. To the extent that such remedial projects are not funded privately, they represent social costs arising from coastal development.

The federal government still subsidizes flood insurance on many coastal properties, though efforts to phase-out this FEMA program have been underway for a few years. However, governments seem only too willing to undertake the investment in public infrastructure and ongoing maintenance made necessary by new coastal development. And like other development projects, tax abatements and other subsidies are still granted for coastal development. Why do these policies escape notice from coastal green elites?  Public outlays with private beneficiaries along threatened coasts are an immediate drain on resources, relieving private developers and property buyers of shoreline risk.

Reynolds (perhaps tongue-in-cheek) and Hanson suggest that new development should be taxed in coastal areas. That, and ending subsidies for development along coasts, is an economically and ecologically defensible alternative to the public expense of ubiquitous sea walls. However, a coastal tax might not be in the immediate interests of elites  who claim that mankind faces an insurmountable global warming problem. Better to put off these sorts of remedial measures, especially while you can tax and regulate fossil fuels, and maybe live on the coast!

The position of the warmist community is that carbon emitters must cease and desist, in the hope that the seas will stop rising. They are willing to destroy entire industries (fossil fuels) in pursuit of their goals, but are unlikely to achieve them without inflicting drastic economic harm. If greens are so amenable to central control of economic activity and individual behavior (so long as they are at the controls), it would be prudent to take precautions now that will help to minimize the damage later. Discouraging coastal development with taxes and denial of subsidies is the sort of classic intervention that any Pigouvian planner should love. There is even evidence that sea levels have been much higher at times in the past. An earnest central planner might say that coastal development should always be discouraged to mitigate the risk of destruction.

I am skeptical of alarmist claims, including those related to rising sea levels. In fact, the connection between carbon emissions, global temperatures and sea levels is not well established, and whether sea levels are rising due to human activity is a matter of some dispute. Furthermore, global sea ice extent is not declining dramatically, if at all, and the storied glacier melts have been greatly exaggerated. Climate activists pursue their agenda despite the gross inaccuracy of past carbon-forcing forecasts, the gaping uncertainty surrounding model predictions going forward, and the crushing expense of the measures they advocate. The expense, however, is not one that activists expect to compromise their own standard of living. They either assume that it will be borne by others or that their draconian prescriptions will usher in an era of “sustainability”, powered by new, renewable energy sources. Not many of these alarmists would boast that their policies can quickly reverse the sea level rises they’ve told us to fear, but they dare not suggest taxes on coastal development until they see more convincing evidence. At least that much is sensible, if ironic!

Precaution Forbids Your Rewards

19 Thursday Feb 2015

Posted by Nuetzel in Regulation

≈ 2 Comments

Tags

Carbon forcing, Climate models, Climate Warming, Coyote Blog, GMOs, Precautionary Principle, psuedoscience, regulation, Risk Management, Warren Meyer

health-and-safety-cartoon

The precautionary principle (PP) is often used to justify actions that radically infringe on liberty, but it is an unreliable guide to managing risk, both for society and for individuals. Warren Meyer makes this point forcefully in a recent post entitled “A Unified Theory of Poor Risk Management“. The whole post is worth reading, but PP is the focus of second section. Meyer offers the following definition of the PP from Wikipedia:

“The precautionary principle or precautionary approach to risk management states that if an action or policy has a suspected risk of causing harm to the public or to the environment, in the absence of scientific consensus that the action or policy is not harmful, the burden of proof that it is not harmful falls on those taking an action.”

He goes on to explain several problems with PP, the most important of which is its one-sided emphasis on the risks of an activity while dismissing prospective benefits of any kind. Enough said! That shortcoming immediately disqualifies PP as a guide to action. Rather, it justifies  compulsion to not act, which is usually the desired outcome when PP is invoked. We are told to stop burning fossil fuels because CO2 emissions might lead to catastrophic global warming. Yet burning fossil fuels brings enormous benefits to humanity, including real environmental benefits. We are told to stop the cultivation of GMOs because of perceived risks, yet the potential benefits of GMOs are routinely ignored, such as higher yields, improved nutrition, drought resistance and reduced environmental damage. Meyer asks whether there is an irony in ignoring these potential gains, as it entails an acceptance of certain risks. Forced energy shortages would bring widespread economic decline. Less-developed countries face risks of continuing poverty and malnutrition that could otherwise be mitigated.

The terrifying risks cited by PP adherents are generally not well-founded. For example, climate models based on CO2 forcings have extremely poor track records. And whether such hypothetical warming would be costly or beneficial, on balance, is open to debate. The supposed risks of GMOs are largely based on pseudoscience and ignore a vast body of evidence of their safety. As Meyer says:

“… the principle is inherently anti-progress. The proposition requires that folks who want to introduce new innovations must prove a negative, and it is very hard to prove a negative — how do I prove there are no invisible aliens in my closet who may come out and eat me someday, and how can I possibly get a scientific consensus to this fact? As a result, by merely expressing that one ‘suspects’ a risk (note there is no need listed for proof or justification of this suspicion), any advance may be stopped cold. Had we followed such a principle consistently, we would still all be subsistence farmers, vassals to our feudal lord.”

The PP has obvious appeal to statists and fits comfortably into the philosophy of the regulatory state. But it’s a reasonable conjecture that widespread application of the PP exposes the world to greater natural and economic risks than without the PP. Under laissez-faire capitalism, human action is guided by the rational balancing of benefits against costs and risks, which has brought prosperity everywhere it’s been practiced.

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