Conspicuous Conservation, the ostentatious display of objects that mark a person as eco-friendly, has become popular over the recent decade, with example of wealthy people making a point of being seen driving a Prius, putting solar panes in silly places and even wearing shoes "suggesting" you worked on the BP oil spill cleanup.
On the opposite side of the coin we are starting to see some rather deplorable examples of Conspicuous Pollution, the most flagrant of which is called "Rollin Coal".
These kids, (they are almost always 20 something rural guys) will spend anywhere from $1,000 to $5,000 modifying their pickups for the sole purpose of belching huge clouds of black exhaust; adding smoke stacks and smoke switches (which either trick the engine into thinking it needs more fuel, or dump diesel fuel directly into the exhaust manifold).
This is not just a handful of guys. Elizabeth Kulze posted an article with links to “an entire subculture” on Facebook, Tumblr, and Instagram. “It’s just fun,” one coal roller says. “Just driving and blowing smoke and having a good time.”