Tag: climate change

Climate Change Concerns Don’t Belong in Dietary Guidelines

On Friday, May 8, the public comment period closed for the new 2015 Dietary Guidelines issued by the U.S. Department of Agriculture (USDA) and the Department of Health and Human Services (HHS). In a nutshell, the new dietary guidelines are to eat a diet richer in plant-based foods and leaner in animal-based products. One of the considerations used by the USDA/HHA in their Scientific Report used to rationalize these new dietary guidelines was that such diets are

“associated with more favorable environmental outcomes (lower greenhouse gas emissions and more favorable land, water, and energy use) than are current U.S. dietary patterns.” [emphasis added]

Throughout the Scientific Report whenever greenhouse gases are mentioned, a negative connotation is attached and food choices are praised if they lead to reduced emissions.

This is misleading on two fronts. First, the dominant greenhouse gas emitted by human activities is carbon dioxide which is a plant fertilizer whose increasing atmospheric concentrations have led to more productive plants, increasing total crop yields by some 10-15 percent to date. The USDA/HHS is at odds with itself in casting a positive light on actions that are geared towards lessening a beneficial outcome for plants, while at the same time espousing a more plant-based diet.

And second, the impact that food choices have on greenhouse gas emissions is vanishingly small—especially when cast in terms of climate change. And yet it is in this context that the discussion of GHGs is included in the Scientific Report. The USDA/HHS elevates the import of GHG emissions as a consideration in dietary choice far and above the level of its actual impact.

In our Comment to the USDA/HHS, we attempted to set them straight on these issues.

Our full Comment is available here, but for those looking for a synopsis, here is the abstract:

There are really only two reasons to discuss greenhouse gas emissions (primarily carbon dioxide) in the context of dietary guidelines in the U.S., and yet the USDA and HHS did neither in their Scientific Report of the 2015 Dietary Guidelines Advisory Committee (DGAC).

The first reason would be to discuss how the rising atmospheric concentration of CO2—a result primarily of the burning of fossil fuels to produce energy—is a growing benefit to plant life. This is an appropriate discussion in a dietary context as atmospheric CO2 is a fertilizer that promotes healthier, more productive plants, including crops used directly as food for humans or indirectly as animal feed. It has been estimated that from the atmospheric CO2 enrichment to date, total crop production as increased by 10-15 percent. This is a positive and beneficial outcome and one that most certainly should be included in any discussion of the role of greenhouse gases emissions in diet and nutrition—but is inexplicably lacking from such discussion in the DGAC report.

The second reason to discuss greenhouse gas emissions in a diet and nutrition report would be to dispel the notion that through your choice of food you can “do something” about climate change.  In this context, it would be appropriate to provide a quantitative example of how the dietary changes recommended by the DGAC would potentially impact projections of the future course of the climate. Again, the DGAC failed to do this.  We help fill this oversight with straightforward calculation of averted global warming that assumes all Americans cut meat out of their diet and become vegetarians—an action that, according to the studies cited by the DGAC, would have the maximum possible impact on reducing greenhouse gas emissions and thus mitigating future climate change.  Even assuming such an unlikely occurrence, the amount of global warming that would be averted works out to 0.01°C (one hundredth of a degree) by the end of the 21st century.  Such an inconsequential outcome has no tangible implications.  This should be expressed by the DGAC and mention of making dietary changes in the name of climate change must be summarily deleted.

We recommend that if the DGAC insists on including a discussion of greenhouse gas emissions (and thus climate change) in it 2015 Dietary Guidelines, that the current discussion be supplemented, or preferably replaced, with a more accurate and applicable one—one that indicates that carbon dioxide has widespread and near-universal positive benefits on the supply of food we eat, and that attempting to limit future climate change through dietary choice is misguided and unproductive.  These changes must be made prior to the issuance of the final guidelines. 

We can only guess on what sort of impact our Comment will have, but we can at least say we tried.

You Ought to Have a Look: Science Round Up—Less Warming, Little Ice Melt, Lack of Imagination

You Ought to Have a Look is a feature from the Center for the Study of Science posted by Patrick J. Michaels and Paul C. (“Chip”) Knappenberger. While this section will feature all of the areas of interest that we are emphasizing, the prominence of the climate issue is driving a tremendous amount of web traffic. Here we post a few of the best in recent days, along with our color commentary.

As Pope Francis, this week, focused on examining the moral issues of climate change (and largely ignoring the bigger moral issues that accompany fossil fuel restrictions), he pretty much took as a given that climate change is “a scientific reality” that requires “decisive mitigation.” Concurrently, unfolding scientific events during the week were revealing a different story.

First and foremost, Roy Spencer, John Christy and William Braswell of the University of Alabama-Huntsville (UAH)—developers and curators of the original satellite-derived compilation of the temperature history of the earth’s atmosphere—released a new and improved version of their iconic data set. Bottom line: the temperature trend in the lower atmosphere from the start of the data (1979) through the present came in as 0.114°C/decade (compared with 0.14°C in the previous data version). The new warming trend is less than half what climate models run with increasing atmospheric carbon dioxide emissions project to have occurred.

While the discrepancy between real world observations and climate model projections of temperature rise in the lower atmosphere has been recognized for a number of years, the question has remained as to whether the “problem” lies within the climate models or the observations. With this new data release, the trend in the UAH data now matches very closely with the trend through an independent compilation of the satellite-temperature observations maintained by a team of researchers at Remote Sensing Systems (RSS). The convergence of the observed data sets is an indication the climate models are the odd man out.

As with most long-term, real-world observations, the data are covered in warts. The challenge posed to Spencer et al. was how to splice together remotely sensed data collected from a variety of instruments carried aboard a variety of satellites in unstable orbits—and produce a product robust enough for use in climate studies. The details as to how they did it are explained as clearly as possible in this post over at Spencer’s website (although still quite a technical post). The post provides good insight as to why raw data sets need to be “adjusted”—a lesson that should be kept in mind when considering the surface temperature compilations as well. In most cases, using raw data “as is” is an inherently improper thing to do, and the types of adjustments that are applied may vary based upon the objective.

Here is a summary of the new data set and what was involved in producing it:

Version 6 of the UAH MSU/AMSU global satellite temperature data set is by far the most extensive revision of the procedures and computer code we have ever produced in over 25 years of global temperature monitoring. The two most significant changes from an end-user perspective are (1) a decrease in the global-average lower tropospheric (LT) temperature trend from +0.140 C/decade to +0.114 C/decade (Dec. ’78 through Mar. ’15); and (2) the geographic distribution of the LT trends, including higher spatial resolution. We describe the major changes in processing strategy, including a new method for monthly gridpoint averaging; a new multi-channel (rather than multi-angle) method for computing the lower tropospheric (LT) temperature product; and a new empirical method for diurnal drift correction… The 0.026 C/decade reduction in the global LT trend is due to lesser sensitivity of the new LT to land surface skin temperature (est. 0.010 C/decade), with the remainder of the reduction (0.016 C/decade) due to the new diurnal drift adjustment, the more robust method of LT calculation, and other changes in processing procedures.

Figure 1 shows a comparison of the data using the new procedures with that derived from the old procedures. Notice that in the new dataset, the temperature anomalies since about 2003 are less than those from the previous version. This has the overall effect of reducing the trend when computed over the entirety of the record.

Figure 1. Monthly global-average temperature anomalies for the lower troposphere from Jan. 1979 through March, 2015 for both the old and new versions of LT (source: www.drroyspencer.com)


Figure 1. Monthly global-average temperature anomalies for the lower troposphere from Jan. 1979 through March 2015 for both the old and new versions of LT. (Source: www.drroyspencer.com)

While this new version, admittedly, is not perfect, Spencer, Christy, and Braswell see it as an improvement over the old version. Note that this is not the official release, but rather a version the authors have released for researchers to examine and see if they can find anything that looks irregular that may raise questions as to the procedures employed. Spencer et al. expect a scientific paper on the new data version to be published sometime in 2016.

But unless something major comes up, the new satellite data are further evidence the earth is not warming as expected.  That means that, before rushing into “moral obligations” to attempt to alter the climate’s future course by restricting energy production, we perhaps ought to spend more time trying to better understand what it is we should be expecting in the first place.

One of the things we are told by the more alarmist crowd that we should expect from our fossil fuel burning is a large and rapid sea level rise, primarily a result of a melting of the ice sheets that rest atop Greenland and Antarctica. All too frequently we see news stories telling tales of how the melting in these locations is “worse than we expected.” Some soothsayers even attack the United Nations’ Intergovernmental Panel on Climate Change (IPCC) for being too conservative (of all things) when it comes to projecting future sea level rise. While the IPCC projects a sea level rise of about 18–20 inches from its mid-range emissions scenario over the course of this century, a vocal minority clamor that the rise will be upwards of 3 feet and quite possibly (or probably) greater. All the while, the sea level rise over the past quarter-century has been about 3 inches.

But as recent observations do little to dissuade the hardcore believers, perhaps model results (which they are seemingly more comfortable with) will be more convincing.

A new study available this week in the journal Geophysical Research Letters is described by author Miren Vizcaino and colleagues as “a first step towards fully-coupled higher resolution simulations with more advanced physics”—basically, a detailed ice sheet model coupled with a global climate model.

They ran this model combination with the standard IPCC emissions scenarios to assess Greenland’s contribution to future sea level rise. Here’s what they found:

The [Greenland ice sheet] volume change at year 2100 with respect to year 2000 is equivalent to 27 mm (RCP 2.6), 34 mm (RCP 4.5) and 58 mm (RCP 8.5) of global mean SLR.

Translating millimeters (mm) into inches give this answer: a projected 21st century sea level rise of 1.1 in. (for the low emissions scenario; RCP 2.6), 1.3 in. (for the low/mid scenario; RCP 4.5), and 2.3 in (for the IPCC’s high-end emission scenario). Some disaster.

As with any study, the authors attach some caveats:

The study presented here must be regarded as a necessary first step towards more advanced coupling of ice sheet and climate models at higher resolution, for instance with improved surface-atmosphere coupling (e.g., explicit representation of snow albedo evolution), less simplified ice sheet flow dynamics, and the inclusion of ocean forcing to Greenland outlet glaciers.

Even if they are off by 3–4 times, Greenland ice loss doesn’t seem to be much of a threat. Seems like it’s time to close the book on this imagined scare scenario.

And while imagination runs wild when it comes to linking carbon dioxide emissions to calamitous climate changes and extreme weather events (or even war and earthquakes),  imagination runs dry when it comes to explaining non-events (except when non-events string together to produce some sort of negative outcome [e.g., drought]).

Case in point, a new study looking into the record-long absence of major hurricane (category 3 or higher) strikes on the U.S. mainland—an absence that exceeds nine years (the last major hurricane to hit the U.S was Hurricane Wilma in late-October 2005). The authors of the study, Timothy Hall of NASA’s Goddard Institute for Space Studies and Kelly Hereid from ACE Tempest Reinsurance, concluded that while a streak this long is rare, their results suggest “there is nothing unusual underlying the current hurricane drought. There’s no extraordinary lack of hurricane activity.” Basically they concluded that it’s “a case of good luck” rather than “any shift in hurricane climate.”

That is all well and good, and almost certainly the case. Of course, the same was true a decade ago when the United States was hit by seven major hurricanes over the course of two hurricane seasons (2004 and 2005)—an occurrence that spawned several prominent papers and endless discussion pointing the finger squarely at anthropogenic climate change. And the same is true for every hurricane that hits the United States, although this doesn’t stop someone, somewhere, from speculating to the media that the storm’s occurrence was “consistent with” expectations from a changing climate.

What struck us as odd about the Hall and Hereid paper is the lack of speculation as to how the ongoing record “drought” of major hurricane landfalls in the United States could be tied in with anthropogenic climate change. You can rest assured—and history will confirm—that if we had been experiencing a record run of hurricane landfalls, researchers would be falling all over themselves to draw a connection to human-caused global warming.

But the lack of anything bad happening? No way anyone wants to suggest that is “consistent with” expectations. According to Hall and Hereid:

A hurricane-climate shift protecting the US during active years, even while ravaging nearby Caribbean nations, would require creativity to formulate. We conclude instead that the admittedly unusual 9-year US Cat3+ landfall drought is a matter of luck. [emphasis added]

Right! A good string of weather is “a matter of luck” while bad weather is “consistent with” climate change.

It’s not like it’s very hard, or (despite the authors’ claim) it requires much “creativity” to come up with ways to construe a lack of major hurricane strikes on U.S. soil to be “consistent with” anthropogenic climate change. In fact, there are loads of material in the scientific literature that could be used to construct an argument that under global warming, the United States should experience fewer hurricane landfalls. For a rundown of them, see p. 30 of our comments on the government’s National Assessment on Climate Change, or check out our piece titled, “Global Savings: Billion-Dollar Weather Events Averted by Global Warming.”

It is not for lack of material, but rather, for lack of desire, that keeps folks from wanting to draw a potential link between human-caused climate change and good things occurring in the world.


Hall, T., and K. Hereid. 2015. “The Frequency and Duration of US Hurricane Droughts.” Geophysical Research Letters, doi:10.1002/2015GL063652

Vizcaino, M. et al. 2015. “Coupled Simulations of Greenland Ice Sheet and Climate Change up to AD 2300.” Geophysical Research Letters, doi: 10.1002/2014GL061142

You Ought to Have a Look: Curry on Worry

You Ought to Have a Look is a feature from the Center for the Study of Science posted by Patrick J. Michaels and Paul C. (“Chip”) Knappenberger. While this section will feature all of the areas of interest that we are emphasizing, the prominence of the climate issue is driving a tremendous amount of web traffic. Here we post a few of the best in recent days, along with our color commentary.

This week, we have two notable items of interest.

First and foremost, a must-read article from Judith Curry’s Climate Etc. blog where Judy quite adeptly introduces us to the concept of an “availability cascade”—a process that has come to dominate and define climate alarmism. Curry writes that an

availability cascade is a self-reinforcing process of collective belief formation that triggers a self-perpetuating chain reaction: the more attention a danger gets, the more worried people become, leading to more news coverage and greater alarm.

She describes how the cascade of events began with the 1992 United Nations Rio Treaty aimed at “avoiding dangerous climate change through stabilization of [carbon dioxide] emissions,” transformed from “global warming” to “climate change” so as to pick up extreme weather events, and now has swept human health into the growing avalanche of woe.

Judy’s article is one of the best pieces we have read on the web is recent weeks (and we’re not just saying that because she incorporates some of our work!). Bravo to her! Here is a longer excerpt, but you (really, really) ought to have a look at the whole thing:

White House Announces Initiative to Focus on Health Concerns of Global Warming: We’ve Already Done It For Them!

Global Science Report is a weekly feature from the Center for the Study of Science, where we highlight one or two important new items in the scientific literature or the popular media. For broader and more technical perspectives, consult our monthly “Current Wisdom.”

It seems like the Obama Administration is a bit behind the times when it comes to today’s announcement that it will start a new initiative to focus on the health effects of climate change.

There is no need for the White House to outlay federal resources for the time and effort that will be involved—we have already done it for them (and, undoubtedly, for a minuscule fraction of the price)!

Two and a half years ago, we released a publication titled “ADDENDUM: Global Climate Change Impacts in the United States” that basically was a non-government-influenced look at how climate change would likely impact the United States in the future, based a lot on current trends in climate and society. We titled it an “ADDENDUM” because the U.S. Global Change Research Program, back in 2009, released a similarly titled report that was so incomplete that, well, it needed an addendum. We knew the government wasn’t going to supply one, so we produced one ourselves.

In our report (available here), we included a chapter on human health. Here are the key messages from that chapter:

  • The health effects of climate change on the United States are negligible today, and likely to remain so in the future, unless the United States goes into precipitous economic and technological decline.
  • Death certificate data indicate that 46 percent of all deaths from extreme weather events in the United States from 1993-2006 were from excessive cold, 28 percent were from excessive heat, 10 percent were from hurricanes, 7 percent were from floods, and 4 percent were from tornadoes.
  • Over the long term, deaths from extreme weather events have declined in the United States.
  • Deaths in the United States peak in the colder months and are at a minimum in the warmer months.
  • In U.S. cities, heat-related mortality declines as heat waves become stronger and/or more frequent.
  • Census data indicate that the migration of Americans from the cold northern areas to the warmer southwest saves about 4,600 lives per year and is responsible for three to seven per cent of the gains in life expectancy from 1970-2000.
  • While the U.S. Global Change Research Program states that “Some diseases transmitted by food, water, and insects are likely to increase,” incidence of these diseases have been reduced by orders of magnitude in the United States over the past century, and show no sign of resurgence.

We effectively show that if you want to focus on the health of Americans, there is no need to bring climate change into the equation—especially if you are hoping to find negative impacts (which appears to be the goal of the Administration).

Scads of new science–on everything from heat-related mortality, to asthma, to extreme weather–continues to support that general conclusion.

Of note is that accompanying today’s White House announcement is an announcement from the USGCRP that it has produced its own reportThe Impacts of Climate Change on Human Health in the United States: A Scientific Assessment.”

Based on loads of past experience with the USGCRP, we can only imagine the worst.

Public comments on this draft of the USGCRP report are due on June 8, 2015. It’s on our calendar.

You Ought to Have a Look: Climate Sensitivity and Environmental Worries Are Trending Downward

You Ought to Have a Look is a feature from the Center for the Study of Science posted by Patrick J. Michaels and Paul C. (“Chip”) Knappenberger.  While this section will feature all of the areas of interest that we are emphasizing, the prominence of the climate issue is driving a tremendous amount of web traffic.  Here we post a few of the best in recent days, along with our color commentary.

More evidence this week that high-end forecasts of coming climate change are unsupportable and Americans’ worry about environmental threats, including global warming, is declining. Maybe the general public isn’t as out of touch with the science as has been advertised?

First up is a new paper by Bjorn Stevens from Germany’s Max Plank Institute for Meteorology that finds the magnitude of the cooling effect from anthropogenic aerosol emissions during the late 19th and 20th century was less than currently believed, which eliminates the support for the high-end negative estimates (such as those included in the latest assessment of the U.N.’s Intergovernmental Panel on Climate Change, IPCC). Or, as Stevens puts it “that aerosol radiative forcing is less negative and more certain than is commonly believed.”

This is important, because climate models rely on the cooling effects from aerosol emissions to offset a large part of the warming effect from greenhouse gas emissions. If you think climate models produce too much warming now, you ought to see how hot they become when they don’t include aerosol emissions. The IPCC sums up the role of aerosols this way:

Despite the large uncertainty range, there is a high confidence that aerosols have offset a substantial portion of [greenhouse gas] global mean forcing.

The new Stevens’ result—that the magnitude of the aerosol forcing is less—means the amount of greenhouse gas-induced warming must also be less; which means that going forward we should expect less warming from future greenhouse gas emissions than climate models are projecting.

Researcher Nic Lewis, who has done a lot of good recent work on climate sensitivity, was quick to realize the implications of the Stevens’ results. In a blog post over at Climate Audit, Lewis takes us through his calculations as to what the new aerosols cooling estimates mean for observational determinations of the earth’s climate sensitivity.

What he finds is simply astounding.

You Ought to Have a Look: An Overreaching Investigation

You Ought to Have a Look is a feature from the Center for the Study of Science posted by Patrick J. Michaels and Paul C. (“Chip”) Knappenberger. While this section will feature all of the areas of interest that we are emphasizing, the prominence of the climate issue is driving a tremendous amount of web traffic.  Here we post a few of the best in recent days, along with our color commentary.

Over the past couple of weeks, prominent members of the climate science/climate policy community have come under attack for not toeing the (Presidential) party line when it comes to how human-caused climate change is being billed and sold via the President’ Climate Action Plan.

The attacks began with Harvard Smithsonian Center for Astrophysics researcher Willie Soon, and thanks to the attention afforded by Justin Gillis in the New York Times, were expanded by Representative Raul Grijalva (D-AZ), to include Richard Lindzen, David Legates, John Christy, Judith Curry, Robert Balling, Roger Pielke Jr., and Steven Hayward.

In this You Ought to Have a Look, we provide links to the subsequent public comments from those researchers under question (who have made them available) in response to this line of investigation—one which many have termed a “witch hunt.”

Current Wisdom: Did Human-Caused Climate Change Lead to War in Syria?

The Current Wisdom is a series of monthly articles in which Patrick J. Michaels, director of the Center for the Study of Science, reviews interesting items on global warming in the scientific literature that may not have received the media attention that they deserved, or have been misinterpreted in the popular press.

Did human-caused climate change lead to war in Syria?

Based only on the mainstream press headlines, you almost certainly would think so.

Reading further into the articles where the case is laid out, a few caveats appear, but the chain of events seems strong.

The mechanism? An extreme drought in the Fertile Crescent region—one that a new study finds was made worse by human greenhouse gas emissions—added a spark to the tinderbox of tensions that had been amassing in Syria for a number of years under the Assad regime (including poor water management policies).

It is not until you dig pretty deep into the technical scientific literature, that you find out that the anthropogenic climate change impact on drought conditions in the Fertile Crescent is extremely minimal and tenuous—so much so that it is debatable as to whether it is detectable at all.

This is not to say that a strong and prolonged drought didn’t play some role in the Syria’s pre-war unrest—perhaps it did, perhaps it didn’t (a debate we leave up to folks much more qualified than we are on the topic)—but that the human-influenced climate change impact on the drought conditions was almost certainly too small to have mattered.