Chapter II
Crimes
Section II
War crimes
Article 11
War crimes involving the employment of prohibited methods of war
Anyone who, in the context of an international armed conflict or a non-international armed conflict:
(i) Launches an 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;
shall be punished with a term of imprisonment of 10 to 25 years.
Compelling a prisoner of war to serve in the forces of a hostile power - IAC
Intentionally launching attacks that will cause environmental damage - IAC
EDIT.