While Wyland's work with the 'Whaling Wall' series is an obvious example of an environmental mural with a definitive purpose/cause: i.e. that of marine life preservation, and even his 'Earth; The Blue Planet' mural previously examined advocates the importance of the oceans, the cause behind a mural may not be so clearly defined as seen in this specific piece which appears locally here at Portland State University. While this piece, which for lack of information I have titled "PSU's Think Green" Mural, is not technically a mural (it's actually a fabric scrim attached to the underside of a sky bridge which connects both Portland State's Smith Memorial Student Union and Cramer Hall) it serves the same purpose as a mural in being a large piece of art in a public area which delivers a message.
On a campus known for "Being Green" (and for more reasons than the fact that that's one of the school colors), where there are more bicycle racks than parking spaces, where such sustainable alternatives as low flow fixtures on sinks, increased wall insulation provide a 51% and 53% efficiency increase for both electricity and natural gas usage respectively, and where ecoroofs have been installed on several roofs to reduce stormwater runnoff, which contributes to urban water pollution, this mural delivers a fitting message indeed.