Marine pollution 50 Marine pollution-- Pollution in Ocean 31 Soil pollution 7 Water pollution 7 Marine ecology 6 Food resources 5 Land resources 5 Marine Pollution 5 Energy resources 4 Forest resources 4 Natural disasters 4 Natural resources 4 Nuclear pollution 4 Oil pollution of the sea 4 Radiation pollution 4 Renewable resources 4 Wasteland reclamation 4 Coastal zone management 3 Heavy metals 3 Human population 3 Marine microbiology 3 Maritime law 3 Mineral resources 3 Non renewable resources 3 Oil pollution 3 Waste disposal in the ocean 3 Water resources 3 marine pollution 3 Climate change 2 Climatic change 2