I wanted to put your thoughts here in perspective. From wikipedia on Carbon Dioxide: "As of March 2009, carbon dioxide in the Earth's atmosphere is at a concentration of 387 ppm by volume." Compared to oxygen, which is around 21%, 387 ppm is 0.0387%.
The combustion reaction is CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) -891 kJ/mol
To translate, 2 oxygen for 1 carbon dioxide.
The variation graph in CO2 in the atmosphere: http://upload.wikimedia.org/wikipedia/commons/1/1c/Carbon_Dioxide_400kyr.png
Is an increase of just over 100ppm. That means that a decrease in oxygen of 200ppm can be assumed with a little leeway given for the numbers. That 200ppm is 0.02% of oxygen, and in the face of 21% in the atmosphere, is really nothing to worry about.
You will be heated to death before the oxygen runs out.
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I wanted to put your thoughts here in perspective. From wikipedia on Carbon Dioxide: "As of March 2009, carbon dioxide in the Earth's atmosphere is at a concentration of 387 ppm by volume." Compared to oxygen, which is around 21%, 387 ppm is 0.0387%. The combustion reaction is CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) -891 kJ/mol To translate, 2 oxygen for 1 carbon dioxide. The variation graph in CO2 in the atmosphere: http://upload.wikimedia.org/wikipedia/commons/1/1c/Carbon_Dioxide_400kyr.png Is an increase of just over 100ppm. That means that a decrease in oxygen of 200ppm can be assumed with a little leeway given for the numbers. That 200ppm is 0.02% of oxygen, and in the face of 21% in the atmosphere, is really nothing to worry about. You will be heated to death before the oxygen runs out.