Report of the International Law Commission to the General Assembly on the work of its forty-third session, U.N. Doc. A/46/10 (1991), reprinted in  2 Y.B. Int’l L.aw Comm’n 107, U.N. Doc. A/CN.4/SER.A/1991/Add.1 (Part 2)
Draft Code of Crimes Against the Peace and Security of Mankind
Article 26. Wilful and severe damage to the environment
An individual who wilfully causes or orders the causing of widespread, long-term and severe damage to the natural environmental shall, on conviction thereof, be sentenced [to . . . ].