Could rising CO2 levels be silently altering our blood chemistry? A new study suggests that the answer is yes, and the implications are both fascinating and concerning. But here's where it gets controversial...
For decades, scientists have been monitoring the Earth's rising carbon dioxide (CO2) levels, a major contributor to climate change. Now, a groundbreaking study reveals that these elevated CO2 levels are not just measurable in the atmosphere, but also in the blood of humans. The research, conducted over 20 years, has uncovered a subtle yet significant shift in blood chemistry, which the scientists believe is directly linked to increased CO2 exposure.
The study, published in Air Quality, Atmosphere & Health, analyzed health data from a US population database. It found that the average blood concentration of bicarbonate, a compound that helps maintain healthy pH levels, has increased by approximately 7% over the study period. This increase mirrors the rise in atmospheric CO2 levels, which have dramatically jumped from around 369 parts per million (ppm) in 2000 to approximately 420 ppm today.
According to the researchers' modeling, if current trends persist, some blood chemistry values could approach the limit of today's accepted healthy range by around 2076. This is a cause for concern, as it suggests that our bodies may not be adapting to the rapidly changing CO2 levels in the atmosphere.
Alexander Larcombe, a respiratory physiologist at Curtin University in Australia, explains, "What we're seeing is a gradual shift in blood chemistry that mirrors the rise in atmospheric carbon dioxide, which is driving climate change. If current trends continue, modeling indicates average bicarbonate levels could approach the upper limit of today's accepted healthy range within 50 years. Calcium and phosphorus levels could also reach the lower end of their healthy ranges later this century."
The study also highlights the potential impact on the body's acid-base balance. When carbon dioxide dissolves in the bloodstream, it alters this balance, leading the kidneys to conserve bicarbonate to maintain blood pH within its narrow healthy range. Bones can also buffer acid by exchanging minerals such as calcium and phosphorus.
While the shifts in blood chemistry are currently small and within the body's tolerable range, the parallel rise is striking. If the researchers are correct, we may see physiological changes at the population level over time. This could have far-reaching implications for human health, as our bodies may not be able to adapt to the rapidly changing CO2 levels in the atmosphere.
Phil Bierwirth, a retired geoscientist affiliated with the Australian National University, notes, "I actually think that what we are seeing is because our bodies are not adapting. It appears we are adapted to a range of CO2 in the air that may now have been surpassed. The normal range maintains a delicate balance between how much CO2 is in the air, our blood pH, our breathing rate, and bicarbonate levels in the blood. As CO2 in the air is now higher than humans have ever experienced, it appears to be building up in our bodies. Maybe we can never adapt such that it is vitally important to limit atmospheric levels of CO2."
This study raises important questions about the potential long-term effects of rising CO2 levels on human health. It also underscores the need for further research to better understand the complex interactions between CO2, blood chemistry, and the human body. As we continue to grapple with the challenges of climate change, this study serves as a reminder of the importance of addressing this global issue.
