an intriguing eco-visualization concept, originally blogged in April 2005, recently seems to have become reality. "Nuage Vert" ("Green Cloud") is a city-scale light installation representing the actual energy consumption (& its accompanying environmental pollution?) of a coal burning power plant.
a high power laser beam illuminates the vapor emission of a coal burning CHP power plant, turning the smoke into a city scale neon sign. the green cloud then grows bigger in real time as local residents take control & consume less electricity.