Related Rule
Germany
Practice Relating to Rule 43. Application of General Principles on the Conduct of Hostilities to the Natural Environment
Germany’s Law Introducing the International Crimes Code (2002) provides:
Anyone who, in connection with an international armed conflict, carries out an attack with military means which may be expected to cause widespread, long-term and severe damage to the natural environment which could be excessive in relation to the overall concrete and direct military advantage anticipated, shall be liable to imprisonment for not less than three years. 
Germany, Law Introducing the International Crimes Code, 2002, Article 1, § 12(3).