Ключевые слова: air, air pollution, atmosphere, carbon, carbon dioxide, carbon footprint, chemical, chemistry, chimney, city, climate, climate change, co2, contamination, danger, dioxide, dirty, earth, ecology, emission, emissions, energy, environment, factory, footprint, gas, global, harm, heat, industrial, industry, manufacturing, object, outdoors, polluting, pollution, precipitation, production, reduction, sky, smog, smoke, smokestack, steam, technology, tower, toxic, warming, waste,