Isn't juxtaposing the future of energy with an unfeeling killbot against the past with a tinman – whose presence in popular culture is one of a loving, brave, kind-hearted man who thought he had no heart when he really had one all along and followed the yellow-brick road that he's rejecting but the killbot is taking – kind of weird symbolism?

I agree with the overall message; the imagery just seems kind of funny. (Also, did the artist need to pull a Ben Garrison and label the seeping barrel of oil "Fossil Fuels"?)