In 2018, the International Law Commission (ILC) celebrated its 70th anniversary. In this commemorative year, the Commission had a number of topics on its agenda. It completed, on second reading, draft conclusions on the identification of customary international law and draft conclusions on subsequent practice in relation to treaty interpretation. These two topics are of particular importance because of their systemic influence on international law. The Commission also completed, on first reading, the draft guidelines on the protection of the atmosphere and the draft guidelines on the provisional application of treaties. Other topics considered by the Commission include peremptory norms of general international law (jus cogens), im...