Pan Global Employee: Where are we going to dump our sludge next?
Pan Global Executive: Well, the Grand Canyon could hold a lot of sludge...Yeah, let's sludge the hell out of the Grand Canyon.
~ Two members of "Pan Global" (a parody of BP Oil) deciding where to put their sludge in Robot Chicken
Polluters are villains who commit crimes against the environment, whether it be out of disrespect and/or greed (such as immoral businessmen) or genuine malice (some supervillains and/or Dark Lords).

They are the opposite of Eco-Terrorists, who commit crimes for what they see as good for the environment.