Ключевые слова: air, atmosphere, brick, building, business, cap and trade, chemical, chimney, cloud, coal, company, danger, dirty, disaster, earth, ecology, electricity, emissions, energy, environmental, exhaust, factory, fuel, generate, global warming, greenhouse gas, grid, industrial, industry, manufacturing, ozone, pollution, power plant, river, sky, smog, smoke, smoke stack, smokestack, station, steam, technology, toxic, waste, water,