Règle correspondante
Burundi
Practice Relating to Rule 43. Application of General Principles on the Conduct of Hostilities to the Natural Environment
Burundi’s Regulations on International Humanitarian Law (2007) lists “the natural environment” under “civilian objects”. 
Burundi, Règlement n° 98 sur le droit international humanitaire, Ministère de la Défense Nationale et des Anciens Combattants, Projet “Moralisation” (BDI/B-05), August 2007, Part I bis, p. 5.
The Regulations adds: “Civilian objects may not be attacked. … This protection is directed at … the natural environment …”. 
Burundi, Règlement n° 98 sur le droit international humanitaire, Ministère de la Défense Nationale et des Anciens Combattants, Projet “Moralisation” (BDI/B-05), August 2007, Part I bis, p. 5; see also Part I bis, p. 19.
Burundi’s Law on Genocide, Crimes against Humanity and War Crimes (2003) states:
[The following are] considered as war crimes:
B. Other serious violations of the laws and customs applicable in international armed conflicts, within the established framework of international law, namely, any of the following acts:
d) launching a deliberate attack in the knowledge that such attack will cause … widespread, long-term and severe damage to the natural environment which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated. 
Burundi, Law on Genocide, Crimes against Humanity and War Crimes, 2003, Article 4(B)(d).
Burundi’s Penal Code (2009) states:
“War crimes” means crimes which are committed as part of a plan or policy or as part of a large-scale commission of such crimes, in particular:
2. … [S]erious violations of the laws and customs applicable in international armed conflict, within the established framework of international law, namely, any of the following acts:
4°. Intentionally launching an attack in the knowledge that such attack will cause incidental, … widespread, long-term and severe damage to the natural environment which would be clearly excessive in relation to the concrete and direct overall military advantage anticipated. 
Burundi, Penal Code, 2009, Article 198(2)(4°).