(http://en.wikipedia.org/wiki/Little_Boy.) This fact was awful; nobody has security when they are dead. Nowadays, what kind of war will happen by using nuclear weapons with new technologies, we can't imagine and we are also afraid of our life in the future. In addition, more and more countries began the investigation of nuclear weapons. Now, the amount of the nuclear weapons probably destroys 6%~10% of the earth (not include the radioactive fallout). (http://www.informationisbeautiful.net/.) So there is possibility that some day in the future the earth could be destroyed. Also if those weapons are used in the war, nobody will triumph, because everyone would die. Therefore, nuclear weapons do not provide security.
Secondly, the processes of producing and storage nuclear and nuclear weapons are really dangerous. Produce nuclear weapons need nuclear energy. Nuclear energy is a kind of energy which is really powerful and dangerous. It will cause danger by many reasons. Natural calamities would cause accidents of nuclear energy. For example, recently, Japan had a nuclear crisis, and this event let people in the world feel unsafe. In March of 2011, earthquake lead Japan had a nuclear crisis. The cooling system of the reactor stopped working and they emitted the seawater into the reactor to let it cool down. The scientists said that they need to use seawater to cool down is because the general measures were not effective. Also in this crisis, the other reactors have been out of control for several times.( http://www.ftchinese.com/story/001037437) The radioactive fallout immediately influenced the residents of that area and in 24 hours, Canada's west coast was checked out the radioactive fallout. Earthquake could make nuclear reactors lose control. That means other natural calamities which have something similar to the earthquake could cause accident to the nuclear energy in the nuclear weapons. Also, the calamities could cause by human mistakes.
