[redpoint5]

Perhaps.

Fire requires fuel, heat, and oxygen. For every Carbon atom it binds 2 Oxygen atoms. Not only is it removing free O2 to reduce its concentration, but also diluting it with inert CO2.

If temperatures have risen a degree, then going from 300 Kelvin to 301 represents an increase in temperature of 0.3%

I know from much experience building fires that they generate their own heat, and the best way to promote the fire is to increase oxygen, which is why we blow on the fire when it's going out and not build a greenhouse around it.

I'm willing to be wrong though.