Many groups such as Scenic America have complained that billboards on highways cause too much clearing of trees and intrude on the surrounding landscape, with billboards' bright colors, lights and large fonts making it hard to focus on anything else. Other groups believe that billboards and advertising in general contribute negatively to the mental climate of a culture by promoting products as providing feelings of completeness, wellness and popularity to motivate purchase. One focal point for this sentiment would be the magazine AdBusters, which will often showcase politically motivated billboard and other advertising vandalism, called culture jamming.
