Check out this eerie and beautiful short film (about a minute and a half), a brief metaphor for wasted energy (via BoingBoing): Light, directed by David Parker.
Sometimes a poetic representation like this one can be more effective than repeating facts over and over. Though, I have seen facts represented poetically on occasion as well, as in the work of Chris Jordan, who creates photographs of everyday objects replicated thousands or millions of times in artistic arrangements to visualize a simple fact such as how many plastic bottles are used in America every minute.
These simple pieces of art present the wastefulness of our society in a thought provoking manner, and don't carry the alienation of judgment. Though I think it is implied that we should waste less, it is not explicit in a "you're doing it wrong" kind of way