εργοστάσιο, πόλη, νέφος, βιομηχανία, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, περιβάλλον, ρύπανση, καμινάδα, καπνός, φυσική δομή, μαύρο και άσπρο
Public Domain
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