Article 1 Code of Crimes against International Law (CCAIL)
Part 2 Crimes against International Law
Chapter 2 War crimes
Section 11 War crimes consisting in the use of prohibited methods of warfare
(3) Whoever in connection with an international armed conflict carries out an attack by military means and definitely anticipates that the attack will cause widespread, long-term and severe damage to the natural environment on a scale out of proportion to the concrete and direct overall military advantage anticipated shall be punished with imprisonment for not less than three years.
Intentionally launching attacks that will cause environmental damage - IAC
EDIT.