Ключевые слова: alternative, building, bulb, business, car, concepts, conservation, contemporary, design, drop, earth, ecology, element, energy, environment, environmental, factory, flower, fuel, generation, globe, green, hand, home, house, human, icons, ideas, illustrations, interface, label, lamp, leaf, life, metaphors, nature, panel, planet, power, recycling, shape, sign, solar, sun, symbol, tree, turbine, water, wind,