I've been kicking this idea around for a while for the Harriet Alexander Nature Center (HANC) in Roseville, Minnesota. In this series of signs and inserts, it is to encourage adults and parents to come to HANC to learn about reducing their carbon foot-print.
(This is sort of inaccurate, as plates 3, 5, and 6 are buildings that no longer exist, but have been uniquely Roseville for many many years.)

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Plate 1  

Plate 2  

Plate 3  

Plate 4  

Plate 5  

Plate 6