Does anyone remember that one smokey the bear psa?

It shows two people wearing oxygen masks walking through what appears to be a desert. The old man tells his granddaughter that when he was her age there were trees everywhere and how people got careless and started forest fires and as a result the forests burned down and everything gets wiped out, because without trees, there is no air. Everything dies as a result and it is all now a desert wasteland. The little girl says, "Grandpa, I wish I could help save the trees for you". I thought it was scary and sad. I would not want to be in their shoes. What did you think of that psa?