Columbia subject headings:
Harvard subject headings:
International relations and terrorism--History--21st century.
International relations--21st century.
Peace--Research
Security, International--International cooperation--History--21st century.
Terrorism and globalization
War--Environmental aspects
Princeton subject headings:
International relations and terrorism--21st century.
International relations--21st century.
Peace--Research.
Security, International--International cooperation--21st century.
Terrorism and globalization.
War--Environmental aspects.