At that first congress ( held at Fontainebleau , France ) , on 5 October 1948 , 18 governments , 7 international organizations , and 107 national nature conservation organizations all agreed to form the institution and signed a `` constitutive act '' creating an International Union for the Protection of Nature .
At the first meeting at Fontainebleau , France , on 5 October , 1948 , 18 governments , seven international organizations , and 107 national nature conservation organizations agreed to form the International Union for the Protection of Nature .