An Environmental Impact Assessment (EIA) is a structured process used by governments, lenders, and project developers to identify, predict, and evaluate the environmental and often social consequences of a proposed activity—such as a dam, mine, highway, or industrial facility—before authorisation is granted. The aim is to integrate environmental considerations into decision-making, propose mitigation measures, and provide a basis for public participation.
Typical stages include screening (deciding whether an EIA is required), scoping (identifying which impacts to study), preparation of an environmental impact statement, public consultation, review by a competent authority, and post-decision monitoring.
The concept was pioneered by the United States under the National Environmental Policy Act of 1969 (NEPA), which requires federal agencies to prepare an Environmental Impact Statement for major actions significantly affecting the environment. The model spread rapidly. Principle 17 of the 1992 Rio Declaration on Environment and Development states that EIA shall be undertaken for proposed activities likely to have a significant adverse impact and subject to a decision by a competent national authority.
At the regional level, the UNECE Espoo Convention (1991) governs EIA in a transboundary context, requiring parties to notify and consult affected neighbouring states. Its Kyiv Protocol on Strategic Environmental Assessment (2003) extends the logic to plans and programmes. The European Union codifies EIA requirements in Directive 2011/92/EU (as amended by Directive 2014/52/EU).
International jurisprudence has reinforced EIA as a general obligation. In the Pulp Mills on the River Uruguay case (Argentina v. Uruguay, ICJ 2010), the International Court of Justice held that undertaking an environmental impact assessment is a requirement under general international law where a proposed industrial activity may have a significant adverse transboundary impact.
For MUN delegates and researchers, EIA is relevant across committees dealing with infrastructure financing, indigenous rights, climate adaptation, and shared watercourses, and is routinely required by lenders such as the World Bank and IFC under their environmental and social safeguards.
Example
In 2010, the International Court of Justice ruled in Pulp Mills (Argentina v. Uruguay) that states must conduct an EIA before authorising industrial activities risking significant transboundary harm.
Frequently asked questions
The ICJ in the 2010 Pulp Mills case affirmed that conducting an EIA is a requirement under general international law where a proposed activity risks significant adverse transboundary impact, though specific procedures are set by national law and treaties like the Espoo Convention.
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