Solus wrote on Jan 23^rd, 2009 at 4:43pm:

you are correct in that burning iso-butane creates less toxic emissions than wood, my guess is that the environmental impact would be greater if you considered the emissions generated by extracting the fuel and packing it into canisters.

That's an interesting point. So what about a wood fire considering that same Carbon will be released by burning or rotting anyway, no?