|Underground percolation of water in state A washes minerals into the waters of an international river, causing a detrimental change in the composition and quality of the water. Such a change is not pollution within the definition contained in Article 21 given that it is naturally occurring.356
356 See S Bogdanovic (ed), International Law of Water Resources – Contribution of the International Law Association (1954-2000), 111.
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No Significant Harm Rule
Protection and Preservation of Ecosystems