A systematic use of violence by a person or an organized group against people or property with the intention of intimidating or coercing societies or governments, usually for political or ideological reasons.

1. The threat to use violent acts that would harm the quality of the environment in order to blackmail a group or society: "Ecoterrorism also includes the actual carrying out of the threats."
2. The sabotage of the activities of individuals or corporations; such as, industrial companies, considered to be polluting or destroying the natural environment.