Globalization and the easy movement of people, weapons, and toxins across borders has transformed security into a transnational phenomenon. This book analyzes the most pressing current transnational security threats, including weapons of mass destruction, terrorism, organized crime, cybercrime, natural disasters, human-made disasters, and infectious diseases. It uses a combination of theory and real-world examples to illustrate the transnational nature of security risks. It considers the applicable international laws and examines how key international organizations are dealing with these issues.