Industry
air, atmosphere, belching, big, blue, carbon, chemical, chimney, climate, co2, coal, dioxide, distribution, ecology, emission, energy, engine, enviromental damage, environment, equipment, exhaust, factory, fossil fuel, fume, gas, generator, global warming, harbor, heat, high, industrial, industry, manufacturing, plant, pollution, power, sky, smog, smoke, stack, steam, supply, tall, toxic, vapor, voltage