Related Rule
Spain
Practice Relating to Rule 147. Reprisals against Protected Objects
Section E. Natural environment
Spain’s LOAC Manual (1996) lists among the persons and objects against whom/which the taking of reprisals is prohibited “the natural environment” and refers to Article 55 of the 1977 Additional Protocol I. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Publicación OR7-004, 2 Tomos, aprobado por el Estado Mayor del Ejército, Division de Operaciones, 18 March 1996, Vol. I, § 3.3.c.(5)(b).
Spain’s LOAC Manual (2007), referring to Article 55 of the 1977 Additional Protocol I, lists “the natural environment” among the objects against which the taking of reprisals is prohibited. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 3.3.c.(5); see also § 11.8.c.