Just like in nature when  it comes to fire it is essential for survival. As humans it is important for survival because it keeps us warm from the cold. Heat is also applied to gas because it what is used to heat our homes in the winter. In order for the TreeDomes to survive in outerspace i created the fire source so that the Tree's could provide an enrgy source to remain in space. To keep the fire source alive it uses human trash and old technology scraps to use as the fires power source. With this green method it helps conserve energy and keeps the TreeDome's alive and well.