Ключевые слова: air, architecture, autumn, chimney, chimneys, cloud, coal, coming, construction, dusk, environment, equipment, factory, fog, forest, fuel, generation, industry, landscape, leaf, machinery, mining, mountain, nature, outdoors, physical, pollution, power, railroad, running, rural, scene, sky, smog, smoke, stack, steam, steel, structure, sunset, supply, technology, track, tracks, train, transportation, tree, yellow,