Here Are 3 Climategate Myths That Have Not Aged Well

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Excessive media coverage of an email hacking tilted the outcome of a critically important event against the victims of the crime. Soundย familiar?

In 2016, it happened to the Hillary Clinton presidential campaign and the Democratic National Committee. That was dรฉjร  vu for climate scientists, who seven years earlier had experienced a nearly identical chain of events leading up to the 2009 UN climate change conference inย Copenhagen.ย 

In summary: emails from the University of East Anglia in the UK were hacked, and many journalists assumed that where there was smoke, there must be fire. Even the Daily Showโ€™s Jon Stewart jumped on the bandwagon, accusing climate scientists of trying to โ€œtrick youโ€ based on a few selective, out-of-context quotes from the hacked emails (though he also later ripped the media for not covering the debunking of the Climategate myth). Commentators at the time were divided over whether this was a media storm, or just a storm in a very Britishย teacup.


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Nonetheless, the Copenhagen climate summit a few weeks later was widely considered a failure. That wasnโ€™t only because of the hacked emails, just as another cache of emails arenโ€™t the sole reason for the words โ€œPresident Donald Trumpโ€ โ€” but in both cases the media-amplified story played a significant role in shaping subsequentย events.ย 

Nine separate inquiries into the email hack exonerated the climate scientists, but came well after the damage had been done. And a decade on, many of the climate science denial myths that emerged from the email hack are still inย play.

So, on the 10th anniversary of what came to be known as โ€˜Climategateโ€™, letโ€™s examine three of the key email quotes that so captured the mediaโ€™s attention, and how the associated science has sinceย evolved.

Spoiler: the deniersโ€™ lies havenโ€™t agedย well.

The misunderstoodย ‘trick’

One quote regularly mangled (most recently in a myth-filled Telegraph article, which was evaluated by the climate scientists at Climate Feedback as having โ€œvery lowโ€ scientific credibility) referred to using โ€œMikeโ€™s Nature trick โ€ฆ to hide the decline.โ€ The ellipses mask that two separate issues were being discussed in this hackedย email.ย 

First, climate scientist Michael Mannโ€™s โ€œNature trickโ€ simply refers to adding temperature measurements from modern instruments to a chart illustrating indirect โ€œproxyโ€ temperature estimates (i.e., analyzing tree ring sizes) in the more distant past. The use of the word โ€œtrickโ€ in the email was in the context of โ€œtrick of the trade,โ€ not โ€œtricking the audience.โ€ If the latter were the case, the use of two different sources of data would not have been labeled as explicitly as possible in Mannโ€™s scientific paper and subsequentย reports.

Second, โ€œhiding the declineโ€ referred to the fact that indirect proxy temperature estimates from tree rings were known to be unreliable after about 1960. From about 1960 to 1990 they showed temperatures falling, whereas we know temperatures actually rose during thatย time.ย 

Tree ring data matched other temperature records accurately prior to 1960 before diverging from the reliable instrumental record thereafter. Climate science research has linked this so-called โ€œdivergence problemโ€ to increases in human-caused pollution in recent decades. The email in question was merely suggesting adding reliable instrumental temperature measurement data so that the chart being discussed didnโ€™t end with a segment of data showing a โ€œdeclineโ€ that was known to be inaccurate. So, in fact, the โ€œtrickโ€ was an effort to give as accurate information as possible (rather than the opposite, as was repeatedlyย alleged).

A related quote (also included in the Telegraph article) claimed that climate scientist Jonathan Overpeck asserted that โ€œwe have to get rid of the Medieval Warm Period (MWP).โ€ This is a fabrication โ€” Overpeck actually said, โ€œI’m not the only one who would like to deal a mortal blow to the misuse of supposed warm period terms and myths in theย literature.โ€ย 

Overpeck was correct that the MWP is incorrectly referenced regularly. For example, the recent much-maligned Telegraph article went on to claim that the MWP (which roughly spanned the years 900 to 1300 AD) โ€œwas even hotter than today,โ€ which is a relatively widespread myth. Numerous studies have reconstructed temperatures over the past several thousand years since Mann and colleagues published their paper in the scientific journal Nature in 1998. All have arrived at the same conclusion: that the MWP was at most a small blip in average global temperatures and that current temperatures are significantlyย hotter.ย 

The most recent and robust such reconstruction was completed by a team of over 5,000 scientists from more than 100 countries contributing to the Past Global Changes (PAGES) 2k network, which produced the following chart of global temperatures over the past 2,000 years. It shows temperatures today rapidly rising above the historical record like the blade of a hockeyย stick.


Global mean surface temperature history over the Common Era (Pages 2k, Nature Geoscience, 2019)

Record oceanย heat

Another oft-referenced quote comes from a stolen email from climate scientist Kevin Trenberth saying, โ€œwe can’t account for the lack of warming at the moment and it is a travesty that weย can’t.โ€ย 

As Trenberth has explained, this email referred to the fact that when it was written in October 2009, measurements of the amount of heat in the Earthโ€™s climate system didnโ€™t match what they should have been based on the overall global energy imbalance (more incoming than outgoing energy) measured by satellites. This discrepancy was due to the limitations of our observational systems, particularly in the deeper oceans โ€” a limitation that at the time frustrated climate scientists likeย Trenberth.

Fortunately for Trenberthโ€™s distress levels, measurements of the heat content of the oceans have improved significantly over the past decade, especially with more data coming from the Argo float network and its 3,000 buoys deployed in oceans around the world. In recent research, Trenberth and colleagues have now resolved his โ€œtravesty,โ€ as heat measured in the oceans and other parts of the Earthโ€™s climate system now match the global energy imbalance from satelliteย measurements.

The oceans absorb over 90 percent of that trapped heat โ€” a vast and accelerating amount. A UN Intergovernmental Panel on Climate Change Special Report on oceans and ice from this year concluded that during the mid-to-late 20th century, the oceans absorbed an amount of heat equivalent to the energy of two Hiroshima atomic bombs every second. Since 1993, the ocean heating rate has gone up to five atomic bombs perย second.

Record surfaceย temperatures

A third popular myth has unraveled as independent reviews into the leak were completed and, well, the world has simply kept getting hotter: the myth that climate scientists were deleting or โ€œmanipulatingโ€ raw data to exaggerate the warmingย trend.ย 

The Independent Climate Change Email Review concluded that the climate scientists were โ€œnot in a position to withhold access to [temperature] data or tamper with it. We demonstrated that any independent researcher can download station data directly from primary sources and undertake their own temperature trend analysis.โ€ Many independent analysts have done just that, downloading the publicly available raw data and demonstrating that it contains a warming trend nearly identical to that in the data that have been adjusted to remove various biases.ย 

In fact, overall the adjustments slightly raise the estimated temperature in the early 20th century so slightly decrease the warming over the past century compared to the rawย data.

Meanwhile, global surface temperatures have continued to rise over the past decade. The past five years have been the five hottest ever recorded, and 2019 will add to that streak, on pace to be the second-hottest on record. Over the past decade, temperatures have risen by about 0.3ยฐC (0.5ยฐF), surpassing the overall 1ยฐC (1.8ยฐF) hotter increase over pre-industrialย temperatures.

Science doesnโ€™tย stop

Fortunately, the world has moved beyond the Climategate debacle ofย 2009.ย 

Not only has climate science continued to become ever-more robust, but most media outlets no longer uncritically parrot myths peddled by climate deniers (with some notable recentย exceptions).

In the face of extreme scrutiny catalyzed by Climategate, climate scientists kept on doing what they do best โ€” researching. And thanks to their efforts, everyone now knows a lot more about causes and scale of the climate change challenge than they did a decadeย ago.

Dana Nuccitelli is an environmental scientist and author of โ€˜Climatology vs Pseudoscience: Exposing the Failed Predictions of Global Warming Skepticsโ€™. He has been a contributor to Skeptical Science for almost a decade and now writes for Yale Climate Connections and otherย outlets.

Main image: Flooded waste bins. Credit: Artyangel, CC0

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