T o d d P a t t i s t wrote:

..... An excess of CO2 will not kill you.

Actually, Todd, that's not true. At Sea Level, even if the O2 content
stays at the standard 20%, an excess of CO2 can be harmful and/or fatal.
The ambient CO2 level is 0.03%. Anything under 1.5% will be pretty much
un-noticeable, but as you get above 3% - 5%, headaches, nausea, and
other symptoms will start. IIRC, as you start getting above 9-10%, you
get into fatal levels. This is all with 20% O2 levels.

NASA has published some interesting studies (got the refs at work, not
here at home) regarding CO2 levels.

.... An absence of oxygen will kill you, but that's
not the fault of the CO2.

No, but an excess of CO2 will do the same.

.... OTOH, CO *will* kill you , even
if everything else you need to sustain life is there.

Also true.

--
Marc J. Zeitlin
http://www.cozybuilders.org/
Copyright (c) 2006