Ключевые слова: air, atmosphere, blue, building, chimney, city, climate, contamination, danger, dawn, dawning, dirty, disaster, dusk, ecology, energy, environment, environmental, evening, factory, fuel, fume, gas, gasoline, global, industrial, industry, manufacturing, oil, orange, pipe, poison, pollute, polluter, pollution, production, reflection, river, silhouette, sky, smog, smoke, smokestack, sunrise, sunset, technology, toxic, warming, waste, water,