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Although only one of the 26 principles enshrined in the Stockholm Declaration is devoted specifically to the protection of nature, it has had an impact on the development of nature protection at an international level as well as in Europe. In any case, the declaration encouraged a large number of States to conclude various international agreements of a sectoral nature, which were supplemented in 1992 by a global agreement on biodiversity. Besides, the EU's role in the development of international law is discussed. Conversely, the ways in which the EU internal rules on nature protection have been influenced by the obligations stemming from MEAs are analysed. Last, the cross-fertilisation between EU and international law is illustrated.