The Myth and Reality of Transboundary Environmental Impact Assessment

Abstract

The dominant story of transboundary environmental impact assessment in international law has the following elements: (1) customary international law prohibits transboundary pollution; (2) according to the classic version of this prohibition, contained in Principle 21 of the 1972 Stockholm Declaration, states must ensure that activities within their territory or under their control do not harm the environment beyond their territory; (3) to ensure that activities within their jurisdiction will not cause transboundary harm, states must assess the potential transboundary effects of the activities; and (4) to that end, states enter into international agreements requiring them to carry out transboundary environmental impact assessment (transboundary EIA) for activities that might cause transboundary harm.