Waste, in legal practice, generally refers to any action or omission by a person in possession of land or other property that significantly harms, diminishes or misuses the asset to the detriment of another interest holder (such as a landlord, reversioner, co-owner or beneficiary). It commonly arises in landlord and tenant law, trusts, co-ownership and succession.At common law in England and Wales, Scotland, Northern Ireland and Ireland, waste includes physical damage (voluntary waste), neglect leading to deterioration (permissive waste) and, in some contexts, significant alteration of the character of land (ameliorating or equitable waste). Life tenants and tenants for years are the classic subjects of waste claims.In the UK and Ireland, “waste” is also a key statutory concept in environmental and planning law, particularly under EU-derived and domestic legislation, where it usually denotes substances or objects which the holder discards, intends to discard or is required to discard. This environmental meaning is distinct but may interact with property, regulatory and commercial disputes, for example in contaminated land, waste-management contracts and permitting. Usage is broadly consistent across the four jurisdictions, subject to specific statutory definitions.