|Dave Fawthrop wrote: |>
|> Not me Wikipedia, or Google will get you lots of other URLs saying |> the same things. | |CO2 isn't toxic inthat it will kill you by poisoning, it may kill you via |the non-presence of oxygen but it's not toxic like carbon monoxide, I think |this is all getting pedantic now anyway, we breath carbon dioxide every day |from our birth to our deaths, if it was poisonous we wouldn't live very |long.
Some people should learn to use Google, and read what they find
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>>Carbon dioxide content in fresh air is approximately 0.04%, and in exhaled air approximately 4.5%. When inhaled in high concentrations (about 5% by volume),
***it is toxic to humans and other animals.***
This is sometimes known as choke damp, an old mining industry term, and was the cause of death at Lake Nyos in Cameroon, where an upwelling of CO2-laden lake water in 1986 covered a wide area in a blanket of the gas, killing nearly 2000.
Hemoglobin, the main oxygen-carrying molecule in red blood cells, can carry both oxygen and carbon dioxide, although in quite different ways. The decreased binding to oxygen in the blood due to increased carbon dioxide levels is known as the Haldane Effect, and is important in the transport of carbon dioxide from the tissues to the lungs. Conversely, a rise in the partial pressure of CO2 or a lower pH will cause offloading of oxygen from hemoglobin. This is known as the Bohr Effect.