Weapons of mass destruction

A weapon of mass destruction (WMD) is a weapon which can harm or kill a significant or big amount of people, destroy cities or nature structures, such as, forests or the biosphere in general at one stroke. WMD's can be classify under the following technologies: chemical or biological (any weapon involving a biological agent, toxin or poisonous chemicals) and radiological or nuclear (any weapon designed to release radiation or radioactivity at a level dangerous to human life or other species). The first time that a well classify WMD was utilized was by United States of America, whose atomic bomb delivery over Hiroshima and Nagasaki caused massive death and DNA diseases for a long period of time. Today, many already have WMD, or have the capability to produce them, and an increasing number are in process of acquiring and developing such weapons. According to article of Dr. Mohamed ElBaradei on May 2003, who stated that: the following countries have declared they possess nuclear weapons and are known to have tested them: Republic of China, France, India, Pakistan, Russia, the United Kingdom, the United States of America, and North Korea. One of the main reasons of this mass destruction weapons proliferation is ultimately a balance of power through nuclear deterrence and fear.

http://en.wikipedia.org/wiki/Weapon_of_mass_destruction