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Author Topic: Health effects of increase in concentration of carbon dioxide in the atmosphere  (Read 2886 times)


  • Frazil ice
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Chronic Respiratory Carbon Dioxide Toxicity: a serious unapprehended health risk of climate change
The earth’s atmosphere has already reached CO2 levels that are outside the range breathed by humans throughout their evolution. As well, in earlier pre-primate epochs, elevated atmospheric CO2 has been found to be a cause of mass extinction events (Knoll et al. 1996)

Despite significant documentation of health issues due to CO2 in indoor environments, there is minimal awareness in the community. For spacecraft and submarines there are practical considerations that influence the recommended safe levels. Initial safe limits for the International Space Station were partly decided by engineering requirements (Cronyn et al. 2012) and submarine limits were balanced by the ability to surface and renew air quality. It seems that there has been little concern about low-level toxicity of CO2 because we have always had the back-up of an ambient atmosphere with low levels of CO2.

As mentioned previously the body compensates for high levels of CO2, through a combination of increased breathing, blood pH buffering, kidney and bone adaptations depending on the length of continuous exposure, until we can resume breathing lower levels of CO2.

One author suggests that blood pH would be reduced to dangerous levels, if there were no physiological compensation, at CO2 levels as low as about 430 ppm (Robertson 2006) implying that compensation would occur at this level. Ambient conditions may already be dangerously close to CO2 levels that will induce continuous body compensation. Moreover, there is strong evidence that, with chronic activity, compensation mechanisms can produce serious health issues such as kidney calcification and bone loss.

It is conceivable that these problems might appear at much lower levels of CO2 if compensation persisted for a much longer periods, for example living a whole lifetime in an elevated CO2 atmosphere of a climate changed future. In the final paper of the US Navy CO2 research program, Schaefer (1982) indicated that this issue had “become the concern of the Department of Energy and other US government agencies” although it appears to have been largely forgotten (or classified) since.

If allowed to persist, problems such as kidney calcification could lead to renal failure. In the extreme case lifespans could become shorter than the time required to reach reproductive age. This could threaten the viability of human and animal species without interventions such as the creation of artificial living environments.

The human species is already impaired in indoor environments and this is likely to get worse as rising outdoor levels of CO2 contribute to increased indoor concentrations. Furthermore, the incidence and prevalence of human kidney calcification (i.e. stones) is increasing globally with the rate highest for males (Romero et al. 2010). Although this may not be related, it is possible that rising office levels of CO2 is a contributing cause. As well there is evidence that CO2 toxicity contributes to a range of serious health issues including cancer, neurological diseases and sleep disorders, and is being experienced by individuals at the current ambient levels which are now 40% higher than pre-industrial levels. It seems likely that CO2 toxicity related to human-induced climate change is already having an unrecognised impact on population health.

From the evidence presented here, there appears to be current health impacts of rising CO2 levels and a significant risk of serious health issues arising in the human population at some time in this century.

 This means that most humans could at this time be experiencing persistent body compensation for acidosis effects resulting in serious health problems. The risk for human and animal population health in the near-future is extremely high and should be communicated since global awareness of this issue may enable a change in CO2 emission activities.
"For my part, whatever anguish of spirit it may cost, I am willing to know the whole truth; to know the worst and provide for it." - Patrick Henry


  • New ice
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OK, I can see health effects starting soon, lf not already.   I know I have increasing boughts of kidney stones.   And my Urology group started a separate phone channel just to deal with Kidney Stones. 

If the body might have to start permamently compensating, what ever that means,  at levels as low as 430.   And we are at 407, rising 3+ points a year.   We could be touching the 430 mark around 2025,  8 years from now.

Although it would be a couple more years before CO2 was always over 430.   And then it would depend on where on the planet you were.

But the below quote sounds like extrapolation to the nth degree.    I would like to see the evidence to back this claim up.

In the extreme case lifespans could become shorter than the time required to reach reproductive age. This could threaten the viability of human and animal species without interventions such as the creation of artificial living environments.


  • Nilas ice
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From 2 yrs ago:

Exclusive: Elevated CO2 Levels Directly Affect Human Cognition, New Harvard Study Shows

[quoteIn a landmark public health finding, a new study from the Harvard School of Public Health finds that carbon dioxide (CO2) has a direct and negative impact on human cognition and decision-making. These impacts have been observed at CO2 levels that most Americans — and their children — are routinely exposed to today inside classrooms, offices, homes, planes, and cars.
Carbon dioxide levels are inevitably higher indoors than the baseline set by the outdoor air used for ventilation, a baseline that is rising at an accelerating rate thanks to human activity, especially the burning of fossil fuels. So this seminal research has equally great importance for climate policy, providing an entirely new public health impetus for keeping global CO2 levels as low as possible.][/quote]


  • Young ice
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The article is not directly for CO2 but ...
More Than Half Of U.S. Medical Professionals Unite To Raise Alarm About Climate Change


  • New ice
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You can't stop CO2 in atmosphere. Its happening and the numbers will be higher every year. Lets say around 20 years ago was no a big problem with CO2. There are more planes cars( the worst one is the really old one), factories, mines. Those number will rise every year. Politics saying that something has to be done, but nothing is happening. They just talking. There is nothing we can do as a little people.
Mark Walter