Abandonment refers to buildings which have been abandoned by the residents or employees. Abandoned buildings reduce land value therefore it can be worthwhile to demolish them. Bulldozing abandoned buildings can make residents in nearby occupied buildings happier. Buildings are abandoned as a result of failures of services and infrastructure. Causes of abandonment include flooding, a build up of garbage, sewage or corpses. A lack of water, electricity or a build up of crime can also drive people away. Another potential deterrent to habitation is high pollution, noise pollution or tax rates. Low land value can cause higher level buildings to become abandoned.