Ключевые слова: air, atmosphere, blue, brick, chemical, chimney, clouds, cloudscape, concept, conservation, danger, dark, dioxide, dirty, dramatic, ecology, economy, effect, emission, energy, environment, environmental, factory, fog, gas, global, grunge, industrial, industry, manufacturing, old, pipe, plant, poison, polluting, pollution, power, problem, protection, refinery, sky, smog, smoke, steam, technology, tower, toxic, vapor, warming, waste, white,