Voir Professor Balthazar, Season 3 - Episode 2

Balthazar Town had, as do all towns, an air pollution problem. Franjo the bee- keeper moved his bees away from town in order to prevent them from dying. When Professor Balthazar solved the pollution problem a new problem cropped up: the fruit trees were no longer producing fruit and this was of course caused by the absence of the bees. But when Franjo returned to the town with his bees everything was alright again.