Practice Relating to Rule 44. Due Regard for the Natural Environment in Military Operations
In its written statement submitted to the ICJ in the Nuclear Weapons (WHO) case in 1995, Costa Rica stated:
Due to the length of the State practice and continued State expression of maintenance and protection of the environment, the Human Right to the Environment may be considered a part of customary international law. Whether it is recognized as a full legal right, it is clear that the Human Right to the Environment would be violate[d] by the threat or use of nuclear weapons.