Related Rule
Colombia
Practice Relating to Rule 43. Application of General Principles on the Conduct of Hostilities to the Natural Environment
In 1996, a study of Colombia’s Presidential Council for Human Rights, conducted in cooperation with the Colombian Red Cross and the Jorge Tadeo Lozano University, asserted that “the principle of proportionality … [is] also directly applicable to the ecological heritage of the human race”. 
Colombia, Presidential Council for Human Rights in cooperation with the Colombian Red Cross and the Jorge Tadeo Lozano University, Academic Study on National Measures of Application of International Humanitarian Law, Bogotá, September 1996, p. 67.