I am thinking of the commercial on TV many years ago (early 80s maybe) in which a glass of water is shown while an African-British actor's cultured voice explains that certain percentages of the world;s water are in oceans, etc. and you watch as the level of water in the glass gets smaller and smaller and he finally says that only 1% of the world's water is drinkable...

then someone taps their cigarette ash into the glass...

and the actor says "Now isn't about time you got DAMNED mad at people who things like THAT?"

This was back in the days when public service announcements about the environment were much more common...