The rules of international law relating to the protection of the atmosphere and other relevant rules of international law, including, inter alia, the rules of international trade and investment law, of the law of the sea and of international human rights law, should, to the extent possible, be identified, interpreted and applied in order to give rise to a single set of compatible obligations, in line with the principles of harmonization and systemic integration, and with a view to avoiding conflicts. This should be done in accordance with the relevant rules set forth in the Vienna Convention on the Law of Treaties, including articles 30 and 31, paragraph 3 (c), and the principles and rules of customary international law.