Ключевые слова: air, area, carbon, catastrophe, chemistry, chimney, clean, climate, company, crisis, dirty, earth, eco, ecological, ecology, economy, energy, environment, environmental, evening, factory, fuel, garbage, garden, global, industrial, industrial area, industries, industry, iron, metal, nature, oxide, petrol, petroleum, pollute, pollution, problem, protect, recycle, refinery, responsibility, smog, smoke, smoking, solution, steam, sun, sunlight, sunrise, sunset, warming, waste,