| http://www.w3.org/ns/prov#value | - Carbon dioxide is volatile enough to our systems that even a 30% concentration of CO2 in the atmosphere can quickly cause unconsciousness and death, with little warning other than fatigue and lightheadedness, according to Sorey et al.'s USGS 2000 article.http://www.indiana.edu/~sierra/papers/2008/havens.html
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