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TOXIC Carbon Dioxide levels
[QUOTE=Omaroo;551179]Don't think so Richard. At the moment, CO2 is a trace gas consisting only 0.038% of the current atmosphere - that's 380 parts per million. For CO2 to be toxic we need around 1% (or 10,000 parts per million) for some humans to even start to be drowsy. There needs to be over 7% in the atmosphere by volume for dizzyness to occur - at which point it really is poisonous. That's 70,000 ppm, or 184 times the current levels.
I don't think so - not in ours or our childrens lifetimes. This is not to say that at these levels, the greenhouse effect would likely be greatly exacerbated.
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You might like to read up a bit about the permafrost regions in the northern hemisphere. The number of frozen days per year has plummeted and scientists are now contemplating the realease of enormous volumes of Methane as the region deteriorates.
If Carbon Dioxide is an issue now, it'll fade into insignificance compared to the Methane problem.
Anyhow... I suspect that the biosphere will self correct in the not so distant future. Shut down the mid Atlantic Conveyor and kiss much of the Northern Hemsiphere good night. The planet is warning us... time to stop talking and take notice I suspect.
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