Соответствующая норма
Sri Lanka
Practice Relating to Rule 44. Due Regard for the Natural Environment in Military Operations
Section A. General
In its written statement submitted to the ICJ in the Nuclear Weapons (WHO) case, Sri Lanka stated: “The protection of the environment in times of armed conflict has … emerged as an established principle of international law.” 
Sri Lanka, Written statement submitted to the ICJ, Nuclear Weapons (WHO) case, undated, p. 3.