The main difference between indoor and outdoor use is that for indoor use they have to make sure there's a high air/fuel ratio, in order to ensure the fuel burns completely into CO2 rather than CO. But you get more heat if you leave the air/fuel mix lean, which is better for outdoor cooking (more heating per unit of fuel) provided that you don't have to worry about carbon monoxide accumulating
But you still have to worry about Global Warming /sarc