global temperatures

You Ought to Have a Look: Global Temperatures and Climate Skeptics

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 features 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.

Highlights from the various and sundry stories from across the web this week:

Over the weekend, a brouhaha erupted over the trustworthiness of the various compilations of the earth’s surface temperature history for the past century or so. This is a simmering cauldron that sporadically boils over with claims of pernicious data manipulation. This week’s eruption began with an article by Christopher Booker in the United Kingdom’s Telegraph headlined “Climategate, the Sequel: How We Are STILL Being Tricked with Flawed Data on Global Warming.” It went from local to global when it was featured prominently and for several days on the Drudge Report.

We immediately sought to temper those claims—in many cases, there are good reasons why the “raw” temperature observations are not the best representation of a location’s (natural) climate. These involve such issues as station moves, instrument changes, inconsistent observing times, and erroneous readings, as well as changes to the microclimate around the thermometer (e.g., fading paint, encroaching trees, spreading suburbia, etc.). To compile a reliable temperature record that best represents how the climate is changing, you need  to  mitigate as many of these confounding effects as much as possible. (Some of those effects are harder to remove than others.) Basically, the “raw” data need to be “adjusted.”

Concerns about the appropriateness of the methodology as well as the accuracy of the adjusted data is at the root of the simmering controversy.

The Great Temperature Adjustment Flap

Matt Drudge has been riveting eyeballs by highlighting a London Telegraph piece calling the “fiddling” of raw temperature histories “the biggest science scandal ever.” The fact of the matter is some of the adjustments that have been tacked onto some temperature records are pretty alarming—but what do they really mean?

One of the more egregious ones has been the adjustment of the long-running record from Central Park (NYC). Basically it’s been flat for over a hundred years but the National Climatic Data Center, which generates its own global temperature history, has stuck a warming trend of several degrees in it during the last quarter-century, simply because it doesn’t agree with some other stations (which also don’t happen to be in the stable urban core of Manhattan).

Internationally, Cato Scholar Ross McKitrick and yours truly documented a propensity for many African and South American stations to report warming that really isn’t happening.  Some of those records, notably in Paraguay and central South America, have been massively altered.

At any rate, Chris Booker, author of the Telegraph article, isn’t the first person to be alarmed at what has been done to some of the temperature records.  Others, such as Richard Muller, from UC-Berkeley, along with Steven Mosher, were so concerned that they literally re-invented the surface temperature history from scratch. In doing so, both of them found the “adjustments” really don’t make all that much difference when compared the larger universe of data. While this result has been documented  by the scientific organization Berkeley Earth, it has yet to appear in one of the big climate journals, a sign that it might be having a rough time in the review process.

AGU 2014: Quantifying the Mismatch between Climate Projections and Observations

Global Science Report is a 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.”

Pat Michaels is in San Francisco this week attending the annual meeting of the American Geophysical Union (AGU) and presenting a poster detailing the widening mismatch between observations of the earth’s temperature and climate model projections of its behavior. Since most global warming concern (including that behind regulatory action) stems from the projections of climate models as to how the earth’s temperature will evolve as we emit greenhouse gases into the atmosphere (as a result of burning fossil fuels to produce energy), it is important to keep a tab on how the model projections are faring when compared with reality. That they are faring not very well should be more widely known—Pat will spread the word while there.

We don’t want those of you who are unable to attend the conference to think you are missing out on anything, so we have reformatted our poster presentation to fit this blog format (it is available in its original format here).


Quantifying the Lack of Consistency between Climate Model Projections and Observations of the Evolution of the Earth’s Average Surface Temperature since the Mid-20th Century

Patrick J. Michaels, Center for the Study of Science, Cato Institute, Washington DC

Paul C. Knappenberger, Center for the Study of Science, Cato Institute, Washington DC


Recent climate change literature has been dominated by studies which show that the equilibrium climate sensitivity is better constrained than the latest estimates from the Intergovernmental Panel on Climate Change (IPCC) and the U.S. National Climate Assessment (NCA) and that the best estimate of the climate sensitivity is considerably lower than the climate model ensemble average. From the recent literature, the central estimate of the equilibrium climate sensitivity is ~2°C, while the climate model average is ~3.2°C, or an equilibrium climate sensitivity that is some 40% lower than the model average.

To the extent that the recent literature produces a more accurate estimate of the equilibrium climate sensitivity than does the climate model average, it means that the projections of future climate change given by both the IPCC and NCA are, by default, some 40% too large (too rapid) and the associated (and described) impacts are gross overestimates.

Cap ‘n Trade: The Ultimate Pork-Fest

Some naive people might have been convinced that the U.S. House voted to wreck the American economy by endorsing cap and trade because it was the only way to save the world.  But even many environmentalists had given up on the bill approved last Friday.  It is truly a monstrosity:  it would cost consumers plenty, while doing little to reduce global temperatures.

But the legislation had something far more important for legislators and special interests alike.  It was a pork-fest that wouldn’t quit.

The President’s New Cars

I had an op-ed yesterday in USA Today about President Obama’s proposed new fuel-economy standards. Don’t like ‘em. Unfortunately, an editing snafu over at the newspaper inadvertently left out the fact that there are four models at present that meet the proposed new standard — the 2010 Honda Insight (41 mpg) and the 2010 Ford Fusion Hybrid (39 mpg) were left off the list.

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