1. Fighting pollution made by humankind: the League of Nations and the endeavors of the convention against the pollution of the sea by oil; 2. The League of Nations and the whaling dilemma; 3. Sanitation, spreading diseases, and the environmental concerns: the League of Nations' campaign for rural hygiene; 4. Raw materials, the timber crisis, and fears of deforestation during the interwar period; 5. Evaluating the environmental regime of the League of Nations: comparative discussion; 6. Conclusion.