Ключевые слова: air, atmosphere, california, chimney, climate, cloud, coal, color image, conservation, daisy, ecology, ecosystem, electricity, emission, energy, environment, environmental, factory, field, flower, global, global warming, grass, green, impact, industrial, industry, landscape, nature, no people, orange, plant, pollution, power, power plant, sky, skyline, smoke, spring, summer, sunset, urban, usa, vertical, vibrant, warming,