相关规则
France
Practice Relating to Rule 43. Application of General Principles on the Conduct of Hostilities to the Natural Environment
France’s Code of Defence (2004), as amended in 2008, states:
It is … prohibited [for combatants] to carry out an attack that may incidentally inflict widespread, long-term and severe damage to the natural environment which is excessive in relation to the military advantage anticipated. 
France, Code of Defence, 2004, as amended in 2008, Article D4122-10.
France’s Penal Code (1992), as amended in 2010, states in its section on war crimes related to international armed conflict:
Intentionally launching an attack in the knowledge that it will cause incidental … widespread, long-term and severe damage to the natural environment which would be clearly disproportionate in relation to the concrete and direct military advantage anticipated for the overall attack … is punishable by 20 years’ imprisonment. 
France, Penal Code, 1992, as amended in 2010, Article 461-28.
Upon ratification of the 1998 ICC Statute, France declared:
The risk of damage to the natural environment as a result of methods and means of warfare, as envisaged in article 8, paragraph 2 (b) (iv), must be weighed objectively on the basis of the information available at the time of its assessment. 
France, Interpretative declarations made upon ratification of the 1998 ICC Statute, 9 June 2000, § 7.