Ключевые слова: air, atmosphere, background, blue, building, chemical, chimney, coal, destruction, dioxide, ecology, emissions, energy, environment, environmental, exhaust dirty, factory, fuel, fumes, gas, global, greenhouse, harmful, high, industrial, industry, landscape, nature, plant, pollution, power, silhouette, sky, smog, smoke, stack, steam, sunset, technology, toxic, warming, waste,