The AMAZING NEW adventures of Superman No. 236 April 1971 DC COMICS 8.0 VF For Sale

During a picnic with Superman, Black Canary declares that she is tired of hearing Green Arrow harp on pollution and its dangers. Superman responds by telling them the story of Dr. Mo-De, a scientist who correctly predicted the impending doom of Krypton, but who could not arouse the attention of his fellow citizens of Surrus thanks to music-flowers that pacified them. Eventually they seized Mo-De and forced him to listen to the flowers until he, too, was pacified. Twenty years after that, Krypton exploded. After Superman finishes his tale, Black Canary gets up and says she is going to speak to the owner of a nearby polluting factory.