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American Focus > Blog > Tech and Science > Climate Change’s Fingerprints Came Early, a Thought Experiment Reveals
Tech and Science

Climate Change’s Fingerprints Came Early, a Thought Experiment Reveals

Last updated: July 4, 2025 10:05 am
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Climate Change’s Fingerprints Came Early, a Thought Experiment Reveals
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Climate change has been a topic of great concern for decades, but a recent thought experiment has shed new light on the early fingerprints of this global issue. In a study led by Ben Santer, Susan Solomon, David W. J. Thompson, and Qiang Fu, researchers delved into the historical roots of climate change to determine when its impact first became evident.

Using simulations from nine state-of-the-art computer models, the researchers made three key assumptions. First, they assumed that in 1860, scientists had the technology to monitor global temperature changes in both the troposphere and the stratosphere. Second, they relied on reliable estimates of human-caused changes in greenhouse gases, particulate pollution, and land use as inputs to the model simulations. Lastly, they assumed that the model-simulated responses to human and natural factors were realistic.

The inspiration for this investigation came from the work of Syukuro Manabe, a renowned physicist who, in 1967, predicted that increasing levels of atmospheric CO2 would lead to warming of the troposphere and cooling of the stratosphere. This prediction, based on a simple climate model, proved to be accurate when compared to later weather balloon and satellite temperature records.

The thought experiment revealed that as early as 1885, the human-caused signal of stratospheric cooling could have been identified. This small but significant change in the atmosphere was distinct from natural patterns of temperature change, such as solar variability and volcanic eruptions. The study suggested that even before the widespread use of fossil fuels, the impact of human activities on the climate was already discernible.

See also  Carlo Rovelli on what we get wrong about the origins of quantum theory

The implications of this early detection of climate change raise important questions about the potential for earlier global action to mitigate its effects. The researchers pointed out that federal funding for climate science in the United States is currently being dismantled, which could lead to a significant loss of data and knowledge in the field.

In conclusion, the study underscores the importance of long-term monitoring of Earth’s climate and the need for continued research to understand the complexities of climate change. By recognizing the early fingerprints of this global issue, we can better prepare for the challenges that lie ahead and work towards sustainable solutions for the future.

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