"Gaia theory has already had a huge impact on science, and has changed the way we view our place in the world. By making us more aware of the damage we are doing to the eco-system, it may also help us to survive. One of the lessons of Daisyworld is that, due to the effect known as hysteresis, damage once done is very difficult to undo. Our experiment with global warming cannot be halted when we are uncomfortable with the effects; by then it may be too late." - 'Gaia Theory: Science of the Living Earth', David Orrell.