Me, I think it would have to MIX - so there would have to be some kind of air movement. If there's a breeze blowing over that acquarium, the CO2 probably won't displace the air, no? It would mix and enter the general atmosphere. And, yes, it's my understanding that the CO2 in mines comes mostly from inside the mine rather than outside. That's one of the reasons the companies are so careful with ventilation.
It has to be that these systems, and the water system you described, aren't used because they aren't economic. For example, bio-ethonol could easily be used in place of gasoline/diesel except petroleum is still cheaper. Those oil shales up there in your neighborhood could produce PRODIGIOUS amounts of petroleum but it's still too costly to use the amount of heat and power necessary to separate out the oil.
In faith, Dave
Viva Texas
dave@christos.cjb.net, dpeirce@christian.net
"God is dead, and we killed him": Nietzsche; "Hmmnnn....": God.
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