The development, production, testing and use of nuclear weapons has had catastrophic humanitarian and ecological consequences on people and environments around the world. ‘Nuclear harm’ – the damage caused by blast, incendiary and radioactive effects of nuclear weapons use, testing and production, as well as by other nuclear technologies – poses threats to the pursuit of the 2030 Sustainable Development Agenda.
Due to advocacy by the International Campaign to Abolish Nuclear Weapons (ICAN), recognized by the 2017 Nobel Peace Prize, the new Treaty on the Prohibition of Nuclear Weapons (TPNW) established ‘positive obligations’ on affected states to assist victims of nuclear weapons use and testing and to remediate contaminated environments. To ensure that the burden does not fall unduly on affected states, the TPNW requires all states to engage in international cooperation and assistance to achieve these and the treaty’s other goals. While the TPNW does not explicitly cover all forms of nuclear harm, and the universalization of the treaty may take some time, its implementation offers the opportunity to build a normative framework and institutional architecture for humanitarian and environmental action to address nuclear harm.