Ключевые слова: black, boiler, burn, burner, burning, business, chemical, chimney, dark, dioxide, distillery, energy, environment, exhaust, factory, fire, flame, fuel, furnace, gas, gasoline, generating, generator, industrial, industry, manufacture, natural, oil, orange, petrochemical, petrol, petroleum, pipe, pipeline, pollute, pollution, power, process, pump, refine, refinery, resource, smoke, tank, tower, toxic, warm, warmth, welding, yellow,