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Published online by Cambridge University Press: 09 March 2016
1 “Preventive Legal Obligations and Principles in Modern International Environmental Law (Praeventive Rechtspflichten und-prinzipien des modernen Umweltvoelkerrechts) ” (1993) 18 Queen’s L.J. 491–501.
2 In this update to the German edition, Hohmann writes: “I must admit that we are on safer legal grounds when we demand State practice (external practice) as an additional requirement of customary law, and I would integrate State practice if asked to write an expert legal opinion.”.
3 Note references omitted in quote.
4 At this point, Principle 15 is quoted as stating: “lack of full scientific certainty shall [sic] not be used as a reason for postponing cost-effective measures.”