The concept of actio popularis is recognised in the 1976 Constitution and its scope has gradually enlarged. A 1998 law concerning environmental NGOs clearly states the conditions under which this right may be exercised. For example, NGOs (whether or not they have a direct interest) may submit a complaint or accusation and initiate the legal actions necessary for the prevention, correction, suspension or cessation of actions and omissions by public and private entities that represent, or may represent, a cause of environmental degradation.