The most convincing argument for solar power emerges as the sun disappears be _low the horizon.as night falls in more and more afghan cities ,streetlights flicker to radiate a pro_tective shield over markets homes and streets light and security are intimately linked With guaranteed illumination people move freely after dark and shopkeepers relax about while staying open late in the evening As crime rates fall and they inevitably do life is enhanced for everyone A quiet revolution is taking place in AF as people become increasingly aware of the benefits of sustainable forms of energy that is to say sources of power and light that never burn out _as diesel, wood and coal do _ or which have to be transported at great expense over long distances.