Major International Treaties: The 1954 Mutual Defense Treaty with the United States is perhaps the most important of the treaties to which South Korea is a party. In addition, South Korea is a state party to the Treaty on the Non-Proliferation of Nuclear Weapons, the Comprehensive Nuclear Test Ban Treaty, the Joint Spent Fuel Management Convention, the Chemical Weapons Convention, the Biological and Toxin Weapons Convention, and the Geneva Protocol. It is also a state party to the following antiterrorism conventions: Marking of Plastic Explosives for the Purpose of Detection, Against the Taking of Hostages, Offences and Certain Other Acts Committed Onboard Aircraft, Suppression of Unlawful Seizure of Aircraft, Suppression of Unlawful Acts Against the Safety of Civil Aviation, Protocol on the Suppression of Unlawful Acts of Violence at Airports Serving International Civil Aviation, and Prevention and Punishment of Crimes Against Internationally Protected Persons, including Diplomatic Agents. It is a signatory to the antiterrorist conventions on Suppression of the Financing of Terrorism and Suppression of Terrorist Bombings. South Korea is also a party to a number of environmental agreements: Antarctic-Environmental Protocol, Antarctic-Marine Living Resources, Antarctic Treaty, Biodiversity, Climate Change, Climate Change-Kyoto Protocol, Desertification, Endangered Species, Environmental Modification, Hazardous Wastes, Law of the Sea, Marine Dumping, Ozone Layer Protection, Ship Pollution, Tropical Timber 83, Tropical Timber 94, Wetlands, and Whaling.