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In an era of terrorism and guerrilla wars, are nuclear weapons a realistic option? Do they make us more secure? Nuclear weapons don't deter suicide bombers or guerrilla fighters. They can't be used in war without producing radioactive fallout that circles the globe and threatens the health of innocents. Perhaps they do deter some hostile governments from harboring thoughts of attacking the US, but that could be done at much lower levels of destructive power.

The cold war's two superpowers still possess huge nuclear arsenals - accounting for over 90 percent of the world's nuclear weapons. The United States has 10,000 nuclear bombs and warheads, half deployed on submarines, …