Unit 2408: Marine Pollution

1. Introduction to Marine Pollution

• Definition of marine pollution
• Sources of marine pollution
  • Point sources (e.g., industrial discharge, sewage outfalls)
  • Non-point sources (e.g., agricultural runoff, atmospheric deposition)
• Types of pollutants affecting marine ecosystems
  • Plastics and debris
  • Oil and hydrocarbons
  • Chemical pollutants (heavy metals, pesticides, nutrients)
  • Biological pollutants (invasive species, pathogens)

2. Impact of Marine Pollution on Marine Life

• Effects on fish species
  • Bioaccumulation and toxicity
  • Habitat degradation
• Effects on seabirds
  • Ingestion and entanglement
  • Reproductive impacts
• Effects on marine mammals
  • Health deterioration and mortality
  • Disruption of food chains
• Effects on coral reefs
  • Coral bleaching and disease
  • Sedimentation and chemical exposure
• Consequences on biodiversity and ecosystem services

3. Plastic Pollution in the Oceans

• Overview of plastic waste in marine environments
• Sources of plastic pollution
  • Land-based sources (urban waste, littering)
  • Ocean-based sources (fishing gear, shipping waste)
• Distribution and accumulation zones (e.g., gyres, coastal areas)
• Harmful effects on marine life
  • Ingestion and entanglement
  • Habitat disruption and toxic chemical transfer

4. Oil Spills and their Consequences

• Causes of oil spills
  • Accidents during extraction, transport, and storage
• Environmental impacts
  • Toxicity to marine organisms
  • Habitat contamination
  • Long-term ecosystem damage
• Economic and social consequences
  • Fisheries and tourism impacts
• Response and cleanup methods

5. Chemical Pollution in Marine Environments

• Types of chemical pollutants
  • Heavy metals (mercury, lead)
  • Agricultural runoff (pesticides, fertilizers)
  • Industrial chemicals (PCBs, PAHs)
• Sources and pathways into the marine environment
• Effects on marine organisms and human health
  • Bioaccumulation and biomagnification
  • Toxicity and disease

6. Microplastics and their Threat to Marine Ecosystems

• Definition and sources of microplastics
  • Primary microplastics (microbeads, pellets)
  • Secondary microplastics (fragmentation of larger plastics)
• Ingestion by marine organisms
• Potential ecological and health risks
  • Transfer through food webs
  • Chemical pollutant carriers

7. Global Efforts to Combat Marine Pollution

• International conventions and agreements
  • MARPOL, London Convention, UNCLOS
• Regional initiatives and policies
  • Regional seas programmes
• Role of governments, NGOs, and industry
• Public awareness and education campaigns

8. Case Studies of Marine Pollution Incidents

• Exxon Valdez oil spill
  • Causes, immediate and long-term impacts
  • Cleanup and restoration efforts
• Deepwater Horizon oil spill
  • Incident overview
  • Environmental and economic consequences
  • Policy and regulatory changes post-spill
• Other notable incidents (briefly)

9. Solutions to Marine Pollution

• Technological innovations
  • Bioremediation
  • Oil spill response technologies
  • Plastic alternatives and recycling technologies
• Waste management strategies
  • Reduction, reuse, recycle principles
  • Improved sewage and industrial waste treatment
• Sustainable practices
  • Responsible fishing and shipping
  • Agricultural best practices to reduce runoff
• Public awareness and community involvement
  • Campaigns, citizen science, and education