Ключевые слова: air, atmosphere, branches, building, chemistry, chimney, city, climate, cloud, damage, dioxide, dirty, ecology, emission, energy, environment, environmental, exhaust, factory, fuel, gas, generation, global, greenhouse, human, industrial, industry, manufacturing, mask, nature, oil, pipe, plant, pollution, power, refinery, silhouette, sky, skyline, smog, smoke, smokestack, stack, steam, sunset, toxic, vapor, warming, waste, water,