International organizations are playing an increasingly important role in the international legal order. They are active in virtually all fields of human activity, they regularly conclude international treaties and continuously interact with other actors of international law. Nowadays, they wield growing normative powers.

The subject of international law brings a lot of concepts to mind, from war and settlement of disputes between States, protection of the environment, responsibilities and obligations, to human rights protection between citizens, refugees of different States and corporations.

Multilateral Environmental Agreements (MEAs) are the predominant legal method for addressing transboundary environmental problems. Adopted by States, MEAs are standard-settings instruments for effective global environmental protection.

The International Law of Treaties is a set of international principles and rules regulating the conclusion procedure of treaties, as well as the issues of operation, amendments and modifications, termination, suspension and invalidity of treaties. For those involved in the drafting, negotiation and conclusion of international treaties, a sound knowledge of the Law of Treaties is indispensable.

The United Nations Institute for Training and Research's (UNITAR) Online Certificate on International Law and the UN system offers a unique opportunity for both students wanting to pursue a career in international law or international relations, and professionals working in international and regional organizations as well as governmental and non-governmental institutions, to expand their knowle