Earthquake, a sudden shaking of the ground, Serious threats, major dangers, Local populations, people living in one area, Whole of mankind, all human beings, Infectious diseases, illnesses that spread from person to person, Wipe out, to destroy completely, Black Plague, the deadly epidemic in Europe during the 14th century, Delayed onset, beginning after a period of time, High mortality, a high death rate, Medical science, the study and practice of medicine, Reduce the risk, make something less dangerous, Nuclear war, a war using nuclear weapons, Cold War, the political conflict between the USA and the Soviet Union, Global military conflict, a war involving many countries, Colossal risk, an extremely great danger, Arise, to happen or begin, Possess nuclear weapons, to own atomic weapons, Specialists, people with expert knowledge, Be convinced, to strongly believe something, Economic war, conflict using trade or financial methods, Political terrorism, violence for political goals, Economic terrorism, violence intended to damage an economy, Feasible, possible and practical, Feasible menace, a danger that could realistically happen, Loss of life, deaths caused by an event, Unscrupulous, having no moral principles, Merciless, showing no pity, Gain access to, obtain the ability to use or enter something, Military advances, improvements in military technology, Powerful organisations, influential groups

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