“The precautionary principle, by virtue of which action to avoid the potential transboundary impact of the release of hazardous substances shall not be postponed on the ground that scientific research has not fully proved a causal link between those substances, on the one hand, and the potential transboundary impact, on the other hand”.

Bron: Convention on the Protection and use of Transboundary Watercourses and International Lakes, Helsinki, Article 2(5)(a), 31 ILM 1312.1992, www.unece.org/env/water/pdf/watercon.pdf