This has been around for a while - surfaces every other year or so. From The Guardian:
Indoor carbon dioxide levels could be a health hazard, scientists warn
Indoor levels of carbon dioxide could be clouding our thinking and may even pose a wider danger to human health, researchers say.
While air pollutants such as tiny particles and nitrogen oxides have been the subject of much research, there have been far fewer studies looking into the health impact of CO2.
However, the authors of the latest study – which reviews current evidence on the issue – say there is a growing body of research suggesting levels of CO2 that can be found in bedrooms, classrooms and offices might have harmful effects on the body, including affecting cognitive performance.
And some numbers:
Traditionally, the team say, it had been thought that CO2 levels would need to reach a very high concentration of at least 5,000 parts per million (ppm) before they would affect human health. But a growing body of research suggests CO2 levels as low as 1,000ppm could cause health problems, even if exposure only lasts for a few hours.
The team say crowded or poorly ventilated classrooms, office environments and bedrooms have all been found to have levels of CO2 that exceed 1,000ppm, and are spaces that people often remain in for many hours at a time. Air-conditioned trains and planes have also been found to exceed 1,000ppm.
OK - let us look at a real-world environment with elevated levels of CO2 in the breathing air. Submarines. They spend months under water and they do scrub the CO2 out of the breathing air but not all of it. This is not needed and much easier to allow a certain level to accumulate. From Anthony Watts, October 17, 2012:
Claim: CO2 makes you stupid? Ask a submariner that question
From Lawrence Berkeley National Laboratory, something that might finally explain Al Gore’s behavior – too much time spent indoors and in auditoriums giving pitches about the dangers of CO2. One wonders though what the Navy submarine service has to say about this new research:
We try to keep CO2 levels in our U.S. Navy submarines no higher than 8,000 parts per million, about 20 time current atmospheric levels. Few adverse effects are observed at even higher levels. – Senate testimony of Dr. William Happer, here
This is backed up by the publication from the National Academies of Science Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants
which documents effects of CO2 at much much higher levels than the medical study, and shows regular safe exposure at these levels…
Data collected on nine nuclear-powered ballistic missile submarines indicate an average CO2 concentration of 3,500 ppm with a range of 0-10,600 ppm, and data collected on 10 nuclear-powered attack submarines indicate an average CO2 concentration of 4,100 ppm with a range of 300-11,300 ppm (Hagar 2003). – page 46
…but shows no concern at the values of 600-2500 ppm of this medical study from LBNL. I figure if the Navy thinks it is safe for men who have their finger on the nuclear weapons keys, then that is good enough for me.
Sigh. Fake Science. Rhetoric and not actual facts. One last quote from the researcher at the Guardian article:
“There is enough evidence to be concerned, not enough to be alarmed. But there is no time to waste,” said Dr Michael Hernke, a co-author of the study from the University of Wisconsin-Madison, stressing further research was needed.
Of course "further research was needed" - that is Dr. Hernke's source of income. Salary and operating costs for his lab. He wants a bigger rice bowl and is willing to prostitute science to get it. Do these people have no shame?
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