Ключевые слова: acid, air, cancer, chemical, chemicals, chimney, cloud, contaminate, contamination, damage, danger, destruction, dirty, dust, ecology, emission, energy, environment, environmental, factory, fume, future, generate, global, greenhouse effect, hell, industrial, industry, ozone, poison, pollute, polluting, pollution, rain, sky, smog, smoke, smokestack, smokestacks, steam, thick, toxic, vapor, warming, waste,