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Uruguay
Practice Relating to Rule 45. Causing Serious Damage to the Natural Environment
Uruguay’s Law on Cooperation with the ICC (2006) states:
26.2. Persons and objects affected by the war crimes set out in the present provision are persons and objects which international law protects in international or internal armed conflict.
26.3. The following are war crimes:
12. Intentionally launching an attack which may be expected to 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. 
Uruguay, Law on Cooperation with the ICC, 2006, Article 26.2 and 26.3.12.
Uruguay’s Basic Information for the Pre-Deployment of Personnel Involved in UN Stabilization Missions (2014), in a section entitled “What is international humanitarian law?”, states:
In the workshop on pre-deployment, we will show a brief audiovisual presentation as an overview of the topic. It is important to remember that international humanitarian law (IHL) is a set of rules that, for precisely humane reasons, seeks to limit the effects of armed conflicts. It protects people not involved or no longer involved in combat and limits the means and methods of warfare. IHL is often also called “law of war” and “law of armed conflict”.
Although during peacekeeping operations or missions we are not in a traditional war scenario, we are in a place where there are conflicts of another kind and our participation may require us to apply these rules. The United Nations is clear in establishing that peacekeeping personnel are subject to and must respect and enforce the rules of IHL.
9.2 METHODS AND MEANS OF COMBAT
- Prohibition of the use of techniques that alter the natural environment. 
Uruguay, Información Básica para el Pre-Despliegue de Personal Subalterno a la Misiones de Estabilizacion de las Naciones Unidas, 4th edition, General Directorate of Defence Policies, Ministry of National Defence, 2014, pp. 38–40.
Uruguay’s Law on Cooperation with the ICC (2006) states:
26.2. Persons and objects affected by the war crimes set out in the present provision are persons and objects which international law protects in international or internal armed conflict.
26.3. The following are war crimes:
48. Using environmental modification techniques for military, combat or other hostile purposes which have widespread, long-lasting or severe effects, understanding as “environmental modification techniques” all techniques for changing, through the deliberate manipulation of natural processes, the dynamics, composition or structure of the Earth, including its biota, lithosphere, hydrosphere and atmosphere, or of outer space. 
Uruguay, Law on Cooperation with the ICC, 2006, Article 26.2 and 26.3.48.