Ключевые слова: alternative, bird, bottle, bulb, car, cloud, color, computer, conservation, contemporary, electricity, energy, environment, environmental, fuel, generation, generator, globe, green, horizon, horizontal, icon, illustration, leaf, light, map, mode, nature, nobody, orange, over, people, planet, plastic, recycling, scenics, sun, sunlight, supply, symbol, transport, transportation, tree, turbine, weather, web, wind,