Related Rule
South Africa
Practice Relating to Rule 43. Application of General Principles on the Conduct of Hostilities to the Natural Environment
South Africa’s ICC Act (2002) reproduces the war crimes listed in the 1998 ICC Statute, including in international armed conflicts:
intentionally launching 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. 
South Africa, ICC Act, 2002, Schedule 1, Part 3, § (b)(iv).