Energy is one of the key factors in bringing about change. Human species ability to control fire gives it boundless ability to bring about change. This is evident all around us at present and through out the story of human evolution on Earth.

The living world around us can restore the state of dynamic equilibrium by changing constitution and distribution of living beings around the planet. Human beings have brought about a phenomenal change in material constitution and material distribution on the planet. The living world cannot balance this act by changing constitution and distribution of living beings alone.

Cataclysmic physical changes on Earth alone have the capacity to balance the impact of human species on the planet. Human species will try everything to keep the natural forces under control. Fire has been used to bring about he changes we see around it and therefore fire alone can be used to restore the state of dynamic equilibrium.

Sustainability is achieved when we repeatedly do and undo a process in time. The efficiency of energy and resource with which we complete a cycle of doing and undoing defines the sustainability standard.