Ключевые слова: air, building, car, chemical, chimney, classic, co2, color, commuter, complex, container, corporate, crossing, danger, day, desert, dirty, electricity, emission, energy, engine, environment, environmental, factory, fast, fog, fuel, global, grunge, horizon, hot, hurry, industrial, industry, landscape, large, locomotive, manufacturing, metal, motion, movement, nature, old, outdoors, plant, pollute, pollution, power, production, rail, railroad, railway, rock, safety, sky, smog, smoke, space, speed, station, stone, structure, sun, sunset, technology, tower, track, train, transport, transportation, vintage, warming, west, wild,