Risk assessment Cost effectiveness 37 Safety measures 35 Nuclear power plants 33 Government policy 31 Environmental aspects 30 Hazardous substances 29 Prevention 29 Risk Assessment 28 risk assessment 28 Environmental law 27 Risk management 25 Technology 25 Health risk assessment 24 Climatic changes 23 Security measures 23 Environmental risk assessment 21 Evaluation 21 Management 21 POLITICAL SCIENCE 21 Pollution 21 National security 19 Terrorism 18 General 16 Radioactive waste disposal 16 Social aspects 15 Health aspects 14 Administrative agencies 13 Decision making 13 Global warming 13