Oceans cover roughly 71% of the Earth’s surface, regulating global climate systems and facilitating over 80% of global merchandise trade by volume. Recognizing the sea as a shared global commons, the International Maritime Organization (IMO), a specialized agency of the United Nations established in 1948, creates the international regulatory framework for safe, secure, and environmentally sustainable commercial shipping, supporting SDG 14 (Life Below Water).

Role of the IMO in Marine Environmental Protection

• 1. The MARPOL Convention (73/78):
  • The International Convention for the Prevention of Pollution from Ships (MARPOL) sets global standards to prevent operational and accidental marine pollution across six specialized annexes: oil spills, noxious liquid substances, harmful packaged goods, sewage, garbage/plastics, and air pollution.
• 2. Decarbonizing Shipping (IMO GHG Strategy):
  • Adopted targets to reduce the carbon intensity of international shipping by at least 40% by 2030, working toward net-zero greenhouse gas emissions by around 2050 through energy efficiency designs (EEDI) and alternative low-carbon marine fuels (green ammonia, methanol, hydrogen).
• 3. Ballast Water Management (BWM) Convention:
  • Regulates ship ballast water discharges through mandatory on-board filtration systems to prevent the transport of invasive aquatic species and pathogens across marine ecosystems.
• 4. Limiting Marine Sulfur Emissions (IMO 2020):
  • Enforced a global sulfur cap reducing allowable sulfur content in marine bunker fuel from 3.5% to 0.50% m/m, lowering sulfur oxide ($SO_x$) emissions and acid rain risks along coastal corridors.
• 5. Designating Particularly Sensitive Sea Areas (PSSAs):
  • Designates ecologically vulnerable marine habitats (e.g., the Great Barrier Reef, the Baltic Sea) for specialized routing restrictions to protect biodiversity from commercial ship strikes and spills.

Role of the IMO in Enhancing Maritime Safety and Security

• 1. The SOLAS Convention, 1974:
  • The International Convention for the Safety of Life at Sea (SOLAS) establishes baseline technical standards for commercial ship construction, fire protection, emergency navigation equipment, and life-saving appliances.
• 2. The ISPS Code:
  • Following September 11, the International Ship and Port Facility Security (ISPS) Code was adopted under SOLAS, providing a standardized security risk-management framework to protect international merchant shipping and ports from terrorist threats and weapons smuggling.
• 3. Suppressing Piracy and Armed Robbery (SUA Convention):
  • The Convention for the Suppression of Unlawful Acts Against the Safety of Maritime Navigation (SUA) provides the legal framework to prosecute maritime piracy, armed hijackings, and offshore attacks, supporting international patrols along chokepoints like the Gulf of Aden and the Strait of Malacca.
• 4. Global Search and Rescue (SAR Convention):
  • Coordinates global maritime rescue operations, dividing ocean basins into designated SAR regions to ensure prompt assistance to vessels and mariners in distress.
• 5. The STCW Convention:
  • Sets international qualification and watchkeeping benchmarks for merchant navy seafarers, ensuring safe navigation operations.

Through conventions and technical regulations, the IMO establishes international standards to protect ocean ecosystems while ensuring safe maritime commerce across the global commons.