methane is the only other greenhouse gas that I can even think of and a fart or two should take care of that! ;)
also I just found out that there is an "ongoing greenhouse" project in the new international space station.
this is what they use in space...
Thats because there is no stale air
Think about this;
NASA can grow plants in space.
and they can do it "long term"
I would call that a sealed environment. :)
Astronauts going to mars would need to grow a good portion of their own food. the trip takes 2 years 1 way.
think about it they cant...
I'd have to agree with TMB77, because I've done it.
as long as you replenish the CO2 levels and keep other levels in check you will do fine.
YouTube - Extreme Grow Room Make Over Part 1
watch that and the 2nd part.
as long as you have good air movement within the room you will do great
I just got this today it works like a champ and it comes with all the crap you need to water filter 2 glass bowls and a remote! yes a remote...
Made In Canada
glass on glass no metal or plastic parts except the whip hose and the screens.
Heats up in under 2 minutes
it gets up to 670 degrees...
The best seeds I've gotten were from greenhouseseeds.nl/shop
But they don't send to the states do you have someone who could send them to you out of the us?