Ecology is all that constantly surrounds us, what we constantly live with, what we breathe, what we eat, that we are trying to protect, and all this is ultimately bad. In the process of our life, we need to warm ourselves, cook food, wash ourselves and for all this we light fire. It does not matter much where the flame burns in the boiler, in the stove or in the barbecue. Light fire still affects the environment and on each of us, namely, gases and harmful substances entering the air when fuel combustion. It is much better if this fuel is the most environmentally friendly, although everything in life is relative.














