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1 Merkin  Tue, Feb 14, 2012 3:04:24pm
whether CO2 is a pollutant is controversial. It is the global food supply and natural emissions are 20 times higher than human emissions

CO2 is poisonous to humans in concentrations higher than 1% of the gas mixture inhaled. While this far more than what is in the atmosphere it does kind of put an end to factious arguments such as these.

2 Bipartite Gnomenclature  Tue, Feb 14, 2012 3:34:16pm

re: #1 Merkin

CO2 is poisonous to humans in concentrations higher than 1% of the gas mixture inhaled. While this far more than what is in the atmosphere it does kind of put an end to factious arguments such as these.

Deadly above 5%.

3 Mich-again  Tue, Feb 14, 2012 5:24:11pm

You are both wrong. CO2 is not harmful to humans in the same way that CO is. The threat of a CO2 rich environment is that there won't be enough O2 to breathe. The CO2 doesn't kill you, the lack of oxygen does. O2 is normally 21% of the atmosphere but most people can survive in O2 depleted air down to 12-15%.

Now as far as the effect on the climate, one example. NASA scientists have warned for years that warming oceans would bring on changes to the ocean's conveyor belt that takes heat from the Southern Atlantic and delivers it to Northern Europe. The prediction was that global warming could lead to a deep freeze in Europe. And now twice in the last 4 years Europe has experienced epic record breaking cold spells across the continent that killed hundreds of people.

4 docproto48  Tue, Feb 14, 2012 6:24:32pm

re: #3 Mich-again

You are both wrong. CO2 is not harmful to humans in the same way that CO is. The threat of a CO2 rich environment is that there won't be enough O2 to breathe. The CO2 doesn't kill you, the lack of oxygen does. O2 is normally 21% of the atmosphere but most people can survive in O2 depleted air down to 12-15%.

CO binds essentially irreversibly with the oxygen carrying hemoglobin in red blood cells greatly reducing the ability to transport oxygen hence really is unrelated to this discussion. High CO2 levels in the bloodstream have serious metabolic consequences something we see every day in hospitals in patients with advanced COPD


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