OK, how about this:
Intro, quote on education.
-story about a man on a beach. He saw thousands of starfish, stranded on the sand. He started wildly picking them up, one by one by one, and throwing them into the ocean. For hours he struggled, one starfish at a time, getting them to safety. An onlooker stood there, laughing. Finally he asked the man what he was doing. Without stopping, the man explained that, without his help,the starfish would die. The onlooker tried to explain that there were thousands of starfish;there was no way to possibly make any sort of a difference before the sun got too strong and they died. The man paused for a second in his work, held up a single starfish, and said: "To this one, it makes a difference."
(I forget the source of the story. You may be able to find it online, or admit that you forget the source.)
Then a short segue into how your students will make a difference in ways big and small in this world???
End quotation, thank you applause.