Rio Declaration on Environment and Development during UN Earth Summit in 1992 consists of 27 principles intended to guide countries in future sustainable development, which has been signed by over 170 countries. Among them, Principle 10 declares that "Environmental issues are best handled with the participation of all concerned citizens, at the relevant level. At the national level, each individual shall have appropriate access to information concerning the environment that is held by public authorities, including information on hazardous materials and activities in their communities, and the opportunity to participate in decision-making processes. States shall facilitate and encourage public awareness and participation by making information widely available. Effective access to judicial and administrative proceedings, including redress and remedy, shall be provided."