Eco friendly marketing is a rapidly growing field, as it should be. With an ever growing number of consumers taking such things into account when choosing which companies to support, a marketer needs to as well, or see their market share go to their competitor.
Now this method in particular isn’t for everyone, as it has social implications from being a bit radical, but some companies have taken to power washing their logo onto dirty sidewalks. It’s hard to prosecute someone for only cleaning part of the sidewalk, and if anyone wants to remove the branding, they have to finish the job. It’s win-win.