Brontosaurus plot
Nicknamed 'Brontosaurus', Tomas is trying to do something about environmental pollution with his own limited resources. He patiently clears the forest and roads and initially resembles a kind of Don Quixote. He is laughed at by his classmates and the teachers have to intervene to point out his noble intentions. With some comrades, he spies on illegal garbage dumps in the forest. As a counter-action, they tie a bag of dirt to a car that has just dumped it. It happens to be the car of the humorless school principal, who is really annoyed by the fact that he has been caught by his students.