ICAN is the international campaign to stigmatise, prohibit & eliminate nuclear weapons. The International Campaign to Abolish Nuclear Weapons (ICAN) is a coalition of non-governmental organizations promoting adherence to and implementation of the United Nations nuclear weapon ban treaty. The truth about nuclear weapons: catastrophic harm, existential threat Nuclear weapons are the most inhumane and indiscriminate weapons ever created. They violate international law, cause severe environmental damage, undermine national and global security, and divert vast public resources away from meeting human needs. They must be eliminated urgently.