UNESCO State of Oceans Report 2024

The UNESCO State of the Ocean Report 2024 highlights the rapid deterioration of ocean health due to climate change, pollution, and biodiversity loss. Oceans cover 71% of Earth’s surface and regulate climate, support biodiversity, and sustain human livelihoods. However, warming seas, acidification, and pollution are severely affecting ecosystems and coastal communities.

Key Indicators of Ocean Health

Sea Surface Temperature (SST)

  • Oceans absorbed over 90% of excess heat from global warming.
  • 2023 was the hottest year for oceans in recorded history.
  • Indian Ocean warming faster than global average, affecting monsoon patterns.
  • Warmer SSTs lead to stronger cyclones, coral bleaching, and disruption of ecosystems.

Marine Heatwaves (MHWs)

  • Frequency has doubled since 1980.
  • Coral bleaching and fisheries collapse are more frequent.
  • Example: Great Barrier Reef lost ~50% of corals; Lakshadweep & Andaman reefs showing bleaching.

Sea Level Rise (SLR)

  • Rising at 3.4 mm per year.
  • Coastal flooding, erosion, and saltwater intrusion increasing.
  • Cities at risk: Mumbai, Kolkata, Chennai, Kochi.
  • Small island nations like Maldives and Tuvalu at risk of submergence.

Hypoxia and Dead Zones

  • Over 500 dead zones globally, caused by pollution and warming.
  • Arabian Sea & Bay of Bengal identified as growing hypoxic regions.
  • Threat to fisheries and biodiversity.

Ocean Acidification

  • Excess CO₂ dissolved in seawater lowers pH, harming shellfish, plankton, and corals.
  • pH dropped from 8.2 to 8.1 (30% increase in acidity).
  • Weakens coral skeletons and food chains.

Impact of Climate Change on Oceans

Fisheries

  • Fish migration patterns shifting due to warming.
  • Declining fish stocks affect food security and economies.
  • 30%+ of global fish stocks already overexploited.

Coral Bleaching

  • Corals expel algae at high temperatures, turning white.
  • Coral reefs provide shelter to 25% of marine species.
  • Loss threatens biodiversity, fisheries, and tourism.

Sea Level Rise and Coastal Communities

  • Coastal erosion, storm surges, and flooding displacing millions.
  • Sundarbans, Mumbai, Chennai, and Kolkata highly vulnerable.
  • Saltwater intrusion damaging agriculture in India and Bangladesh.

Key Threats to Marine Biodiversity

Coral Reef Destruction

  • 50% of reefs lost since 1950.
  • Causes: bleaching, acidification, destructive fishing, and pollution.
  • India: Gulf of Mannar & Lakshadweep reefs severely affected.

Overfishing and Bycatch

  • One-third of fish stocks overexploited.
  • Shark populations declined 70% due to bycatch.
  • India: Decline in Hilsa, Pomfret, and Tuna; conflict between artisanal fishers and trawlers.

Habitat Loss (Mangroves, Seagrass, Wetlands)

  • Mangroves and seagrasses disappearing rapidly.
  • Loss of breeding grounds for fish and marine species.
  • India: Sundarbans mangroves threatened; wetlands vanishing in Kochi and Mumbai.

Marine Pollution

  • 12 million tonnes of plastic waste enter oceans annually.
  • 80% of marine litter is land-based.
  • Microplastics found in seafood and water supplies.
  • India: Ganga, Yamuna, and Brahmaputra among top rivers carrying plastic waste.
  • Oil spills and chemical pollution damaging coastal ecosystems.

Impact on India

  • Coral bleaching in Gulf of Mannar & Lakshadweep.
  • Mangrove loss in Sundarbans affecting biodiversity and fisheries.
  • Decline of key fish species.
  • Rising ocean acidity threatening Indian fisheries.
  • Fishermen face declining catches, toxic seafood, and health risks from pollution.

Policies and International Efforts

India’s Initiatives

  • Plastic Waste Management Rules (2022): restrictions on single-use plastics.
  • Swachh Sagar, Surakshit Sagar Campaign (2022): coastal clean-ups.
  • National Oil Spill Contingency Plan: emergency response framework.
  • Namami Gange Programme: reducing river pollution.

Global Treaties

  • MARPOL Convention (1973/78): prevents ship pollution.
  • London Convention (1972): regulates ocean dumping.
  • Basel Convention (1989): controls hazardous waste movement.
  • SDG 14: calls for marine biodiversity protection.

UNESCO Report Recommendations

  • Stricter regulation of plastic waste exports.
  • Development of alternatives to single-use plastics.
  • Stronger oil spill prevention and enforcement.

Conclusion

The UNESCO State of the Ocean Report 2024 reveals alarming declines in marine health due to warming, pollution, and overfishing. Oceans are critical for climate regulation and livelihoods, yet face mounting pressures. For India, protecting coral reefs, mangroves, and fisheries is essential for food security and coastal resilience. The report stresses urgent international cooperation, stronger regulation, and investment in sustainable ocean practices to secure a healthier future for marine ecosystems and humanity.