Sometimes you really do have to start at a beginning level of science to truly understand the big picture of climate change. This may not seem like a big deal either, but it is.
What is Science?
So many Americans are confused about what is science, especially when it comes to climate change. A broad disconnect exists between scientists nearly accepting climate change at over 95% and the polarized view of Americas on this subject. As a child, I did not do well at science in school. I found the concepts to be hard. If you would have told me as a child that I would be speaking about science now as a park ranger and a climate change communicator, I would not have believed you.
However I want to understand basic science definitions, so I do have a proper understanding when I do engage people on the subject of climate change, especially the contrarians. This is where my friend, Carole Holomuzki, came to my rescue. Since 2010, she has been a ranger colleague at Crater Lake National Park during the summers. For the rest of the year, Carole teaches science classes at Ohio State University at the Mansfield campus. When I met her in June, 2010, Carole had a way of explaining science to me in a crystal clear way I had never grasped before then. She informed me that “science never proves. Science explains.”
This was a big aha moment for me. Before then, I incorrectly spoke phrases such as “scientists proving climate change.” In a sense, it liberated me to hear this because I struggled to “prove” to doubters that climate change exists. I would get thrown off my game of explaining climate change when doubters would say to me, “Where is the proof of climate change?”. Literally, I felt like I had my shackles removed because it was clear from this seasoned science teacher and friend that “The Goal of science is NOT to prove but to EXPLAIN some aspect of the natural world.”
Why doesn’t science prove?
|Professor Carole Holomuski
In 2010, Carole also generously shared her powerpoint that she uses to teach her Introductory Biology 101 class about science. What jumped out at me was the quote Carole uses from the Eugenie Scott book, Creation vs. Evolution, “Science is ‘Truth without certainty.'” Unsure what this quote meant, I e-mailed Carole about this yesterday. Her response:
“Although we try to make sure that the data is at least 95% likely not to be due to chance, we always leave room for some other explanation to be the reason for what we are observing. Sometimes we know it’s so unlikely that we would find another explanation that we would think someone a fool for hesitating to accept our explanation (for instance, that the world is not flat, or that germs cause disease) but we NEVER PROVE.”
Even though science cannot prove, it can disprove. NASA scientist Dr. Lin Chambers told me directly at a NASA & National Park Service Earth to Sky V: Communicating Climate Change Conference in Shepardstown, West Virginia last September that “My job as a scientist is to prove you are wrong.” Prove or disprove, I was confused. I e-mailed Dr. Chambers yesterday about my confusion. Her response: While it is true that science pretty much never “proves” anything, it is definitely true that science can disprove things! Proof requires 100% CERTAINTY, which science really never provides. Disproof in some ways has a much lower bar.”
Dr. Chambers wanted me to add these examples of how it is easier to disprove than prove. In very complex science like earth science, she wrote, “It can be relatively easy to show at the 95% confidence level that something is NOT true (I.e., the Sun’s variations do not account for the recent warming); it is harder to show at the same level of confidence that something IS true. For example, CO2 certainly has an effect on warming, but so do many feedbacks dependent on CO2, as well as volcanoes, aerosols, the Sun (in a small way), etc.” A colleague of hers calls it, “Unscrambling the egg.” Chambers stated is a big challenge for scientists to give a high certainty to each factor.
So Brian, what does this have to do with climate change?
Besides the public and my previous misconception about “science proves,” there are so many other misconceptions about science. When I chat with people who are dismissive of climate change, one of their biggest misconceptions is their understanding of the word THEORY.
The key to Science, especially climate science, is understanding what is a THEORY.
Critics of climate change, such as Newt Gingrich, refer to climate change as “just a theory.” As if a theory is a flimsy item that is easily dismissed. However scientists define the word theory different than the common street definition. As Carole explained to me, the common use of the word theory is a ‘best guess’ or idea.
However the scientific definition of a theory is ‘A comprehensive explanation of some aspect of the natural world that is supported by a vast body of evidence.’ (National Academey of Science)
You may have a theory (a guess or belief) that big foot exists. However, unless it is supported by a large body of evidence (live animals, DNA samples, etc), scientists will not support a scientific theory that bigfoot exists.
According to NASA, there are multiple lines of evidence pointing to the existence of human caused climate change, such as sea leve rise, global temperature rise, warming oceans, declining sea ice, glacial retreat, increase in extreme weather events, and ocean acidifciation.
Carole also informed me that “scientists have a more detailed understanding of climate change than the physics of gravity.” Climate change is a very strongly supported theory of science. Unlike bigfoot or Newt Gingich’s understanding, it is not a belief, speculation or an just an idea.
Even more, as Carole tells her students, “The goal of science is to build THEORIES.” This is a huge and vital statement because I recently had a critic of climate change confront me about this. He was critical of climate science because the scientists, “borrow from each other’s work. I am not hearing anything original.” Scientists building on each other’s work is not a weakness of science, it is a strength. This is how science progresses and keeps improving upon its ability to explain our world. Furthermore, if a theory cannot generate new hypotheses (a possible explanation for a set of observations) and provide basis for new research, than it is generally not considered to be a good theory. Theories are the building blocks of science, just as bricks are a vital material for someone building a house.
Public vs. Scientists perception of Facts vs. Theories
What is even more amazing from what I saw from Carole’s powerpoint is that I and the general public have an upsidedown view of the Hierarchy of Scientific Explanation.
Somehow, the public has the notion that in science:
Most Important: Fact
Least Important: Hypothesis
However, scientists see the Hiearchy of Scientific Explanation completely different:
According to scientists:
Most Important: Theory
Least Important: Fact
What really surprised me from Carole’s teachings about science is “there is no level of scientific certainty higher than that of Theory!!!” This is because theories are “supported by a large body of evidence and many observations.” As mentioned in the previous section, this makes human caused climate change change an incredibly strong theory because there is an overwhelming amount of evidence and many observations to support it.
However, people love to hear facts. From Carole’s power point, science defines facts as “a confirmed observation or measurement.” Facts are significant to scientists. After all, facts “provide important conclusions to scientists.” However, they not nearly as vital to scientists as theories and hypothesis. The problem with facts, as Carole teaches her students, is that “facts do not explain.” Again the goal of science is to “to EXPLAIN some aspect of the natural world.”
Science also makes discoveries that enables us to live better lives.
As I have become more interested in communicating about climate change with the public, it has troubled me to hear people bash science when they do not accept climate change. They scoff at scientific uncertainty that scientists still debate the future consequences of climate change. One of the biggest dissenters of climate change, Oklahoma Senator James Inhofe focused on the uncertainties in a speech to the US Senate on April 8, 2005. As evidence, he twisted the quotes from the National Academy of Sciences 2001 report, citing such phrases as “considerable uncertainty in current understanding,” “estimates should be regarded as tentative and subject to future adjustments,” “because of the large and still uncertain level of natural variability,” “uncertainties in the time histories of various forcing agents,” and “cannot be unequivocally established.”
|Dr. Ignaz Semmelweis
Uncertainty in science is not a weakness of science, but it is a strength. The theories, hypothesis, laws, and facts are not set in stone. As theories are tested independently by other scientists and new evidence emerges, theories can be rejected, modified or accepted. A great example why science should not be set in stone is the story of Hungarian Doctor Ignaz Semmelweis in the 1850s. Dr. Semmelweis noticed too many mothers and children dying in his medical clinic. His hypothesis was these deaths could be reduced by the medical staff washing their hands before handling patients, especially if medical staff came immediately from handling bodies at the adjacent morgue. He ordered the staff to wash their hands. The result was an immediate reduction of fatal puerperal fever from up over 10% of patients to 1 to 2%. However, the scientific community responded with hostility because the accepted thought was an imbalance of “humors” within the body caused disease. Dr. Semmelweis was shunned by other doctors, and he lost his job at the hospital where he worked and he soon died afterwards in insane asylum. However, Semmelweis was vindicated after his death when Louis Pasteur developed the germ theory of disease which provided a theoretical explanation for Semmelweis’ findings.
|Author Paul Hawken
Speaking of uncertainty in science as a strength, I like what author Paul Hawken said about this in an e-mail to me:
“If (doubters of climate change) say the science is uncertain, you tell them that if the want certainty, it is called mathematics. science is uncertain, it never knows the final answer. that is its gift, that is why we keep making new discoveries, discoveries that have probably saved many lives in any room. we still do not fully understand the physics of gravity—much uncertainty there—but that doesn’t mean we jump out of skyscrapers.
The competitive nature of science has only strengthened the theory of climate change.
In the previous story about Dr. Semmelweis, you may wonder if the situation reverse today. Could the entire scientific community be wrong and the few scientists who reject climate change be correct? Fair question. Dr. Chambers gave me great response to this in her e-mail:
|NASA Scientist Dr. Lin Chambers
“Scientists are a competitive, nerdy bunch. We like to understand things, and we like to understand them better than the next guy. The idea that all scientists would blindly accept a “party line” on climate science is pretty ludicrous to anyone who is familiar with scientists. If someone really could prove that the idea is wrong they would have lasting fame. The basic modus operandi of a scientist is two-fold: 1) to observe and try to understand; 2) to poke at other scientists’ theories and try to see whether they hold up. Broadly speaking, climate science holds up. At this point, arguments are about details around the edges.”
Even the top scientists in America are still competitive about looking to find some way disprove climate change. However, the vast amount of evidence climate science has made it impossible so far.