Published on 02 Feb 2025
Marine pollution refers to the introduction of harmful or deleterious substances into the oceans and seas, leading to adverse effects on the marine environment.
Causes of marine pollution
Oil Spills: Catastrophic release of crude oil, devastating marine ecosystems and harming wildlife.
Example: Deepwater Horizon oil spill in the Gulf of Mexico (2010).
Plastic Pollution: Endangering marine life through ingestion and entanglement along with the presence of microplastics.
Example: Great Pacific Garbage Patch
Chemical Pollution: Runoff of pesticides and industrial chemicals, degrading water quality.
Example: Agricultural runoff carrying fertilizers and pesticides leading to eutrophication.
Heavy Metals: Mercury contamination etc and bioaccumulation in aquatic organisms.
Example: Mercury contamination from industrial discharges impacting fish in Minamata Bay, Japan.
Shipping Activities: Ballast water discharge, introducing invasive species and disrupting local marine ecosystems.
Example: Spread of the zebra mussel through ballast water discharge in the Great Lakes.
Hazardous Waste Dumping: Disposal of industrial waste contributing to long-term marine contamination.
Example: Dumping of chemical waste in the North Sea during the mid-20th century.
Unsustainable fishing practices: Harming marine ecosystem and increasing pollutants
Example: Blast fishing in the Srilankan coast
Effects of marine pollution
Fisheries Decline: Significant decline in fish populations, impacting fisheries.
Example: Overfishing and oil spills in the Gulf of Mexico.
Coral Reef Degradation: coral bleaching and threatening the health and diversity of the reef ecosystem.
Example: Great Barrier Reef coral bleaching.
Economic Losses: Effect tourism and blue economy.
Example: Oil spills, like the Exxon Valdez in Alaska, causing extensive economic losses for the fishing and tourism industries.
Health Risks: To both marine animals and humans.
Example: Mercury contamination in fishes like tuna leads to health concerns for human consumers.
Climate change: Carbon dioxide absorption by the oceans causes ocean acidification.
Example: Arctic and Southern oceans.
Tackling marine pollution
International cooperation: Promoting global collaboration to minimize marine pollution.
Example: The London Convention and Protocol regulate the dumping of waste at sea
Legislative measures: To limit pollution and regulation of construction activities
Example: CRZ regulations, Plastic Waste Management Rules, 2016
Sustainable Fishing Practices: Quotas and fishing gear modifications to prevent overfishing and reduce bycatch.
Example: Seasonal Closures and Fishing Quotas:
Oil Spill Response Preparedness: Advances in oil spill response technologies, enhance the ability to contain and clean up spills.
Example: Dispersants and booms
Green Shipping Practices: In the shipping industry to reduce air and water pollution.
Example: Adoption of cleaner fuels, like liquefied natural gas (LNG), in the shipping industry
Restoration and Rehabilitation Projects: To revive damaged reef and mangrove ecosystems.
Example: Biorock technology for the restoration of corals
Geography
Marine pollution
Causes of marine pollution
Effects of marine pollution
Tackling marine pollution
General Studies Paper 1
Physical Geography