| Acknowledgements | 第4-5页 |
| 摘要 | 第5-6页 |
| Abstract | 第6页 |
| Chapter One Introduction | 第9-13页 |
| Chapter Two Literature Review | 第13-21页 |
| 2.1 Redefining National Security and the New Term Environmental Security | 第13-15页 |
| 2.2 The Linkage between Environment and National Security | 第15-17页 |
| 2.2.1 Environment as a Threat to National Security | 第15-16页 |
| 2.2.2 Environment Not as a Threat to National Security | 第16-17页 |
| 2.3 Securitization of Environmental Security in the United States | 第17-20页 |
| 2.3.1 Military as the Implementer of Environmental Security | 第17-18页 |
| 2.3.2 Securitization of Environment in American National Security Policies | 第18-20页 |
| 2.3.3 Implication of Securitizing Environment in American Environmental and Foreign Policies | 第20页 |
| 2.4 Beyond Existing Literature | 第20-21页 |
| Chapter Three Theoretical Framework and Methodology | 第21-24页 |
| 3.1 Theoretical Framework: Insight from the Copenhagen School | 第21-22页 |
| 3.2 Methodology | 第22-24页 |
| Chapter Four Evolution of Environmental Security | 第24-46页 |
| 4.1 A Quantitative Overview | 第24-28页 |
| 4.2 Securitization of Environment in the Bush Sr. Administration | 第28-33页 |
| 4.3 Securitization of Environment in the Clinton Administration | 第33-38页 |
| 4.4 Securitization of Environment in the Bush Jr.Administration | 第38-42页 |
| 4.5 Securitization of Environment in Barack Obama's Period | 第42-46页 |
| Chapter Five Analysis | 第46-60页 |
| 5.1 Overall Context of International System | 第46-47页 |
| 5.2 Self Identification of the United States in the International Arena | 第47-50页 |
| 5.3 Perception of Enviroironmental Security | 第50-52页 |
| 5.4 Congress | 第52页 |
| 5.5 Presidential Commitment to Environment | 第52-56页 |
| 5.6 Environmental Threats in Terms of Environmental Crisis | 第56-60页 |
| Chapter Six: Conclusion | 第60-62页 |
| 6.1 Summary of the Paper | 第60-61页 |
| 6.2 Contribution of this Paper | 第61页 |
| 6.3 Limitation and Suggestions for Future Studies | 第61-62页 |
| Works Cited | 第62-70页 |
