1. the Permanent Court of Justice also endorsed the principle of limited territorial sovereignty. It held that states undertaking work on an international waterway should take into account interests of other states;12 R. Int'l Arb. Awards,1957
2. The appointed tribunal determined that the treaties, together with customary international law principles, mandated that one state has a duty to notify other states when its actions may impede their environmental enjoyment. Additionally, the tribunal determined that;Brian R Popiel;From Customary Law to Environmental Impact Assessment: A New Approach to Avoiding Transboundary Environmental Damage Between Canada and the United States,1995