Ключевые слова: 238, abstract, air, allergy, art, carbon, cartoon, cheer, chemical, chimney, coal, collage, contamination, damage, design, dioxide, dirty, doodle, drawing, ecology, emissions, environment, factory, fuel, gas, illustration, industry, male, man, manufacturing, metallurgy, miniature, nature, oil, pipe, pollution, positive, smile, smog, smoke, station, tower, worker, young,