Ключевые слова: abstract, alternative, artistic, background, buildings, bulb, city, colorful, concept, creative, design, development, drawing, earth, eco, ecological, ecology, energy, environment, environmental, future, gradient, graphic, green, idea, illustration, imaginary, lamp, modern, planet, plant, power, power plant, rainbow, recycle, recycling, save, solar, sustainable, think, town, tree, turbine, water, white, wind, windturbine, world,