Ключевые слова: air, atmosphere, buildings, carbon, care, chimney, city, clean air, climate, could, damage, dioxide, dirty, dust, earth hour, eco friendly, ecological preservation, ecology, economy, emissions, energy efficiency, environment, environmental protection, factory, flight, fog, fuel, future, green energy, health care, healthy living, industrial, industry, life, nature, ozone layer, pollution, poor, prayer, preserve, protect, safety, salvation, save, smog, smoke, top view, town, yellow,