I guess the problem is ventilation. Warm air always goes up, and I guess arctic explorers have a sort of an opening at the top of the tents, like a chimney, to

I guess the problem is ventilation. Warm air always goes up, and I guess arctic explorers have a sort of an opening at the top of the tents, like a chimney, to let the gas out. Otherwise they'd die just as much (also, in subzero temps the definition of "warm" is different than when out camping - there I guess charcoal gases could hover, especially in a sealed tent where it's warmer than outside...)