Land resources Energy resources 6 Food resources 6 Wasteland reclamation 6 Water resources 6 Forest resources 5 Mineral resources 5 Renewable resources 5 Disaster management 4 Ecosystems 4 Marine pollution 4 Nuclear pollution 4 Radiation pollution 4 Natural disasters 3 Non renewable resources 3 Nuclear hazards 3 Climatic change 2 Environmental studies 2 Human population 2 Natural resources 2 Noise pollution 2 Pollution and Degradation 2 Soil pollution 2 consumerism 2 disaster management 2 AIDS 1 AIDS/HIV 1 Air resources 1 Alternative energy resources 1 Biodiversity 1