Propaganda from “Foxnews Climategate” continues to poison the public’s perception

climate gate

The tree-ring divergence problem, at the center of 2009’s “Climategate,” can be explained by normal changes in light intensity Mark Ralston/AFP/Getty In November 2009, climate skeptics had their day in the sun when an anonymous hacker posted years worth of emails sent back and forth between some of the world’s most prominent climate scientists, working with the Climate Research Unit (CRU). Buried within these thousands of emails were a handful of fragments that skeptic seized on as proof positive that climate scientists had fabricated the idea of man-made global warming. After the emails were made public, a media frenzy ensued; “Climategate” culminated in deep investigations into the legitimacy of the science that backed of the theory of a man-made global warming. Ultimately, the CRU scientists were acquitted of any malfeasance, and their science was verified to be clean, but the events had a significant impact on public perception.false news

Five years later, a new study published in Nature Communications may help cool the lingering fallout from Climategate. The study, led by Alexander Stine of San Francisco State University and Peter Huybers at Harvard University provides a compelling scientific explanation for the issue at the center of the 2009 controversy: the tree-ring divergence problem.

Scientists are nearly 100 percent sure of the world’s daily temperatures for the last 150 years or so—which is when we started to keep daily weather records. But before that, it’s a little less clear. So many climate scientists, on both sides of the debate, have come to use tree rings, in conjunction with other proxy measurement tools like coral growth, isotope variation in ice cores, ocean and lake sediment records, and more, in order to reconstruct temperatures changes over years.

“The tree-ring records are in many ways the best record we have,” says Stine. “There are trees all over the Earth, and they have this annual resolution, which very few of our proxies do.” Trees reflect a more ring ringshuman time scale; ice core records show temperature changes across time periods on the order of millions and millions of years, while trees rings track changes year by year. In temperate climates (like much of the U.S.), trees only grow during the part of the year referred to simply as the growing season. In the Northern Hemisphere, this is the spring and summer. In a good growing season—where there’s plenty of precipitation and warm temperatures for months on end—the resulting growth ring will be relatively wide. In poor growing seasons, the rings will be narrow.

It’s not perfect, but it’s a pretty decent proxy for those years before thermometers and recordkeeping. The problem, though, is that since the 1960s, arctic tree-ring growth seems to not match the actual temperature records we have. Thermometer measurements show a sharp jump in temperature in the late 20th century. This is one of the primary arguments for man-made climate change: as the global population increased, and we began to build bigger and more industrial cities, and rely more on fossil-fuel based travel in cars and planes, humans greatly sped up the warming of the planet. But arctic tree-ring records don’t back this up. In fact, they seem to indicate a decline in temperatures during those years. This is called the tree-ring divergence problem, and has been recognized, accounted for, and written on extensively—not the least notably by Keith Briffa, one of the CRU scientists singled out as supposedly burying data after the emails were leaked, in a paper published almost a decade before Climategate.

Briffa had put forth—and the scientific community had long-since accepted—the notion that this “divergence issue” was actually a strong decline in tree sensitivity to temperatures after 1960—and not the temperature themselves. In fact, Stine says, if you look more closely at the numbers you can see that year to year, the rings on an individual tree in the Arctic Circle still do change size with year to year temperature changes—there is just a “systematic underprediction by the tree rings” that began in the mid-20th century. “And when you average all the trees, everything goes away except for that systematic underprediction.”

In 2009, critics from latched on to one email in which Phil Jones, at the time the head of the CRU, wrote that in a recent graph (prepared for a World Meteorological Organization Report) he used “Mike’s Nature trick of adding in the real temps to each series for the last 20 years (i.e., from 1981 onwards) and from 1961 for Keith’s to hide the decline.”

It was unfortunate phrasing. Jones was referring to the famous “hockey stick” graph used by by Michael Mann, the director the Earth System Science Center at Pennsylvania State University, in an article published in the journal Nature, in which he combined a number of different data sources to show overall global temperature increase over the years. According to Mann, the criticism was simply a “cynical misrepresentation” of Jones’s email, which he tells Newsweek “spoke of something that was already well known to the scientific community—that tree-ring density data should not be used to depict temperatures after 1960.” Following the release of these emails, Mann was extensively investigated for any scientific misconduct—and completely acquitted.

Today, Mann says that the whole Climategate fiasco was based around the misconception that the only evidence there is for climate change from the paleoclimate record (i.e., the record of the climate change throughout the entire history of earth) was from tree rings. “Nothing could be further from the truth,” he says. “[There are] multiple independent lines of evidence for human-caused climate change. And the most important evidence for modern warming comes from instrumental measurements—thermometers—not paleoclimate data.”

Stine points out that in most of the scientific papers at the time, researchers would typically plot tree-ring records and thermometer records next to each other—then make an argument about the gaps between the two. “I don’t think you need to argue too hard to convince me that thermometers are better than tree-ring records,” says Stine. “What got turned into a big hoopla was the putting together of a summary graph, to say ‘this is our best interpretation of what the numbers have been.’”

Nevertheless, Stine and Huybers set out to explain the tree-ring divergence data—mostly, Stine says, because he wanted to get a better sense of what the Earth’s most ancient trees are actually able to tell us. Their solution is simple, elegant, and intuitive: global dimming. Since the 1960s—exactly when tree-ring data started to go awry—“there’s been large scale decreases in the amount of light that’s reaching the earth,” says Stine. It’s fairly easy to see why, too. In rapidly industrializing parts of the world with fewer emissions laws—like Southeast Asia—the light decline is particularly steep, and continues into the 21st century. On the other hand, in areas like the U.S. and Europe, you see a rapid decline in the middle of the 20th century, but then light levels steady themselves later on—right around the time most air pollution laws were put into place.

Trees of course, need light to grow—they use photosynthesis to turn light energy into chemical energy to fuel all their activities, including their growth. “My hypothesis,” says Stine, “is that the light is directly affecting tree growth: You turn down the lights, you turn down tree growth.

In the scientific community, skeptics of human-induced climate change have mostly been silenced; the 2014 National Climate Assessment published Tuesday unequivocally laid global warming and its resulting environmental impacts at the feet of human civilization, stating ominously that “climate change, once considered an issue for a distant future, has moved firmly into the present.”

But the specter of Climategate continues to haunt public perception. The Pew Research Center has been tracking climate change beliefs since 2006. In that year 77 percent of Americans thought that there was “solid evidence the Earth is warming” and only 17 percent thought there was no evidence; in 2009 the believers had dwindled to 57 percent while skeptics grew to 33 percent of the population. In 2013, the numbers had moved closer, but not quite, to where they were seven years earlier, with 67 percent believing in climate change and 26 percent expressing skepticism. Likewise, Gallup polls tracking what percentage of Americans attribute global warming to human influences show it hovering around 60 percent until 2010, when it dropped down to 50 percent; it has since climbed steadily back up, reaching 57 percent in 2013 and 2014.

Though Stine and Huybers’s study provides a good explanation for why tree-ring data doesn’t match thermometer readings (and one that Briffa and others had actually suggested as early as 1998), Mann doesn’t think it matters much. “I don’t see how this or any other study is relevant to the issue of ‘undoing’ any ‘damage,’” says Mann, who reiterates that that the “the only wrongdoing was the criminal theft of the emails in the first place.”

Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research, was also dragged through the mud in 2009, and he also calls into question the lack of serious investigation into the email hacking. “All of the scientists were exonerated,” he tells Newsweek, “While not a single investigation was made of those climate change deniers who misused and abused the records, and no one has been brought to justice for stealing the emails.”

Today, the CRU homepage continues to boldly and unapologetically display a graph showing drastic global temperature increases.

 

http://www.newsweek.com/climategate-revisited-new-theory-explains-tree-ring-controversy-250208

Advertisements

8 thoughts on “Propaganda from “Foxnews Climategate” continues to poison the public’s perception

  1. Why does this article get an Arkley Tag?

    Like

    • Arkley is a big doubter/denier. You can hear him regularly on KINS talkshop laughing and ridiculing anyone who thinks it’s a problem.
      that’s why I’d tag him

      Liked by 2 people

    • You should ask Rose Welsh what she thinks about climate change

      Like

    • “You should ask Rose Welsh what she thinks about climate change”

      Just google what Rush Limpdick says about it. Get it straight from the asses mouth.

      Like

  2. because like George Bush he is a good whipping boy for the “progressive” left of Dumboldt.

    Like

  3. Great links from the New York Times this week on climate change. “On Climate, Republicans and Democrats Are From Different Continents” *, and “Rubio on a Presidential Bid, and Climate Change”.
    Here is what a likely standard bearer for the Republican Party said on Climate Change. “Asked how big a threat he regarded climate change, Mr. Rubio replied: “Our climate is always changing. And what they have chosen to do is take a handful of decades of research and say that this is now evidence of a longer-term trend that’s directly and almost solely attributable to man-made activities.””

    The Republicans are failing on climate change. It’s going to be harder and harder for them to keep up the deception as evidence mounts for real, serious and real serious problems.

    Locally Supervisor Bass is walking a fine line. On the KHSU debate she acknowledged climate change was real, but I didn’t hear or remember specifics about what the County can and should do. With the intentional gridlock in Washington from the Right based on the mantra that no government is better than some government, I firmly believe in another largely conservative mantra – the best government is a local government; at least until we can talk some sense into these Glenn Beck, Rush and Foxified red states.

    * http://www.nytimes.com/2014/05/08/upshot/on-climate-republicans-and-democrats-are-from-different-continents.html?action=click&contentCollection=U.S.&module=RelatedCoverage&region=Marginalia&pgtype=article

    ** http://www.nytimes.com/2014/05/12/us/politics/rubio-says-he-is-ready-to-be-president.html?hp&_r=0

    Thanks for the climate change coverage.

    Liked by 2 people

  4. I Rubio debunking CC. Florida is one of the states most at risk with the new weather.predictions All states with a coast line need to at least accept the possibility that it might be happening. Only fools put their heads in the sand.

    Liked by 2 people

  5. See Robert Samuelson’s column yesterday. The right is moving away from AGW is a hoax to admitting it’s true but there is nothing that can be done because: 1. It will hurt the economy. 2. China and India are now the biggest sources.

    Those arguments, of course, ignore the fact that we can’t afford to do nothing, that the costs of climate change will ultimately be horrific losses of GDP, property damage and massive deaths from global starvation and that most of China and India’s CO2 emissions are due to our (Western 1st world countries) products being manufactured there because of few regulations to curb greenhouse gases and the low wages such corrupt governments allow the manufacturers to pay. The carbon from burning ancient forests and their peat forest floors for the palm oil found in most processed foods to is another problem, of course.

    Boycotting and blocking imports of products from countries which refuse to cut their emissions is probably the only way to get them to take action. I’m on board.

    Liked by 1 person

Leave a Reply

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

WordPress.com Logo

You are commenting using your WordPress.com 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 )

Google+ photo

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

Connecting to %s