This advert does make use of the techniques described, namely selective presentation of information, and the power of imagination, but there is also an additional persuasive tactic at work: perceptual contrast. Put simply, this contrast principle means that when we see two things in succession which are different to one another, we tend to view them as more different than they really are (Cialdini, 2001).
Drawing on this tactic, the advert depicts two environments which differ greatly. You either notice the ugly, polluted environment in the background first, followed by the clean, green environment in the foreground, or vice versa. Either way, a contrast is created between the two, emphasising how different the first environment you notice is compared to the second. A study by Kenrick and Gutierres (1980) illustrates this principle well. Male college students were exposed to extremely attractive females, before being asked to rate the attractiveness of an average looking female in a photograph. Prior exposure to the attractive females led males to rate the average female as significantly less attractive, compared to a control group who were not exposed to the attractive females, suggesting that the contrast created affected their judgements.
Cialdini, R. B. (2001). Inﬂuence: Science and practice. Boston: Allyn & Bacon.
Kenrick, D. T., & Gutierres, S. E. (1980). Contrast effects and judgments of physical attractiveness: When beauty becomes a social problem. Journal of Personality and Social Psychology, 38, 131.
Sherif, M., Taub, D. and Hovland, C. I. (1958). Assimilation and contrast effects of anchoring stimuli on judgements. Journal of Experimental Psychology, 55, 150-155.