Nuclear Disarmament and Ecological Impacts of Nuclear Weapons

The only guarantee against the use of nuclear weapons is their total elimination – but our world continues to live in the shadow of nuclear catastrophe.
We must urgently reverse course and return to a common path to nuclear disarmament.
– António Guterres, UN Secretary General

There is an urgent need to stop the erosion of the nuclear order. All countries possessing nuclear weapons have an obligation to lead.
– Tatiana Valovaya, Director-General of the UN Office at Geneva

Over 80 Years After Hiroshima and Nagasaki

In 1945, the only two nuclear bombs ever used in warfare were detonated over Hiroshima and Nagasaki, Japan, killing approximately 210,000 people within months and sickening tens of thousands more with cancer and lifelong diseases.

That same year, the United Nations Charter was adopted and signed. The birth of the UN is inextricably intertwined with the destruction wrought by the nuclear bombs that fell on Hiroshima and Nagasaki.

Since its earliest days and resolutions, the Organization has recognized the need to totally eliminate nuclear weapons. The prospect of nuclear weapons being used intentionally, by accident or miscalculation, is dangerously high. Nuclear weapons are being modernized to become stealthier, more accurate, faster and more dangerous. And the relationships between nuclear-armed States are precarious – defined by distrust, a lack of transparency and dearth of dialogue. Nuclear sabres are being rattled, with bellicose rhetoric not seen since the Cold War.

– Message of Antonio Guterres, UN Secretary-General, to the Nagasaki Peace Memorial Ceremony on the 75th Anniversary of the Atomic Bombing of Nagasaki (2020)

Yet today, around 13,400 nuclear warheads exist, with most being more powerful than those two bombs dropped on Hiroshima and Nagasaki. The world has succeeded at reducing some of the risks, especially after the end of the Cold War, but Izumi Nakamitsu, United Nations Under-Secretary-General and High Representative for Disarmament Affairs, has said the danger is now higher than it has been in generations.

1970: Treaty on the Non-Proliferation of Nuclear Weapons (NPT)

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT), which entered into force in 1970, is a landmark international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation in the peaceful uses of nuclear energy and to further the goal of achieving nuclear disarmament and general and complete disarmament.

The Treaty is regarded as the cornerstone of the global nuclear non-proliferation regime and an essential foundation for the pursuit of nuclear disarmament. The Treaty represents the only binding commitment in a multilateral treaty to the goal of disarmament by the nuclear-weapon States. On 11 May 1995, the Treaty was extended indefinitely. A total of 191 States have joined the Treaty, including the five nuclear-weapon States. More countries have ratified the NPT than any other arms limitation and disarmament agreement, a testament to the Treaty’s significance.

A Review Conference of the Parties to the NPT takes place every 5 years after the adoption of the Treaty. Due to the COVID-19 pandemic, the Tenth Review Conference was held on 1 – 26 August 2022. The next Review Conference will take place in 2026.

1972: Principle 26 of the Stockholm Declaration to Ban Nuclear Weapons

The United Nations Conference on the Human Environment met in Stockholm on 5-16 June 1972 and considered the need for a common outlook and for common principles to inspire and guide the peoples of the world in the preservation and enhancement of the human environment. In the Declaration of the United Nations Conference on the Human Environment, principle 26 draws attention to the ban on nuclear weapons.

Man and his environment must be spared the effects of nuclear weapons and all other means of mass destruction. States must strive to reach prompt agreement, in the relevant international organs, on the elimination and complete destruction of such weapons.

1996: Comprehensive Nuclear-Test-Ban Treaty (CTBT)

The Conference on Disarmament (CD) began its substantive negotiations on a comprehensive nuclear-test-ban treaty in January 1994 within the framework of an Ad Hoc Committee established for that purpose.

The Comprehensive Nuclear-Test-Ban Treaty (CTBT), which was adopted in 1996, and has been signed by 185 countries. However, for the CTBT to enter into force, it must be signed and ratified by 44 specific nuclear technology holder countries, eight of which have yet to ratify the Treaty: China, Egypt, India, Iran, Israel, the Democratic People’s Republic of Korea, Pakistan and the United States.

The Preparatory Commission for the Comprehensive Nuclear Test-Ban Treaty Organization (CTBTO) is an international organization established by the States Signatories to the Treaty on 19 November 1996 and has its headquarters in Vienna, Austria.

2017: Treaty on the Prohibition of Nuclear Weapons (TPNW)

The Treaty on the Prohibition of Nuclear Weapons (TPNW) includes a comprehensive set of prohibitions on participating in any nuclear weapon activities. These include undertakings not to develop, test, produce, acquire, possess, stockpile, use or threaten to use nuclear weapons. The Treaty also prohibits the deployment of nuclear weapons on national territory and the provision of assistance to any State in the conduct of prohibited activities. States parties will be obliged to prevent and suppress any activity prohibited under the TPNW undertaken by persons or on territory under its jurisdiction or control. The Treaty also obliges States parties to provide adequate assistance to individuals affected by the use or testing of nuclear weapons, as well as to take necessary and appropriate measure of environmental remediation in areas under its jurisdiction or control contaminated as a result of activities related to the testing or use of nuclear weapons.

The Treaty was adopted by the Conference at the United Nations on 7 July 2017 and opened for signature by the Secretary-General of the United Nations on 20 September 2017. On 20 September 2020, the eve of the United Nations 75th anniversary commemoration at the annual General Assembly, an open letter coordinated by the Geneva-based group International Campaign to Abolish Nuclear Weapons (ICAN) was released with 56 former heads of states and defense ministers imploring their current leaders to join the Treaty, which is only six ratifications shy of the 50 needed to take effect. The letter also asserted the increased risks of nuclear-weapons use.

2021: Treaty Enters into Force

The Treaty on the Prohibition of Nuclear Weapons (TPNW) formally entered into force on 22 January 2021, after Honduras became the 50th Member State to ratify on 24 October 2020. As of August 2024, there are currently 93 signatories and 70 states parties to the treaty.

2022: TPNW First Meeting

At the First Meeting of States Parties to the Treaty on the Prohibition of Nuclear Weapons, which took place on 21-23 June 2022 in Vienna, Austria, States parties adopted the Vienna Action Plan, with 50 concrete and progressive actions to implement the treaty and work towards a world free of nuclear weapons. The States parties also adopted the “Vienna Declaration” reaffirming their determination to realize the complete elimination of nuclear weapons.

2023: TPNW Second Meeting & Preparatory Committee for 2026 NPT Review Conference

The second Meeting of States Parties was held at the UN Headquarters in New York from 27 November to 1 December 2023. The Meeting conducted thematic discussions on the humanitarian impact of nuclear weapons and adopted a Declaration entitled “Our commitment to upholding the prohibition of nuclear weapons and averting their catastrophic consequences”. The Meeting took several decisions, including the establishment of a consultative process on security concerns of States and working towards the establishment of an international trust fund for victim assistance and environmental remediation at the third Meeting.

Ahead of the 2026 Review Conference of the Parties to the Treaty on the Non-proliferation of Nuclear Weapons, the Preparatory Committee is held its first session from 31 July to 11 August 2023 in Vienna. This will be the first of three planned sessions that will be held prior to the 2026 Review Conference. The Preparatory Committee, open to all States parties to the Treaty, is responsible for addressing substantive and procedural issues related to the Treaty and the forthcoming Review Conference.

2024: Preparatory Committee for 2026 NPT Conference

The second session of the Preparatory Committee for the 2026 Review Conference of the Parties to the Treaty on the Non-proliferation of Nuclear Weapons was held from 22 July to 2 August 2024 in Geneva.

2025: TPNW Third Meeting

The Third Meeting of States Parties took place on 3 to 7 March 2025 at United Nations Headquarters in New York.

The meeting concluded by adopting a Political Declaration and package of decisions, including by setting the date for the first TPNW Review Conference, 30 November to 4 December 2026 at United Nations Headquarters in New York.

2026: NPT and TPNW Review Conferences

The 2026 Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons will take place from 27 April to 22 May 2026 at United Nations Headquarters in New York.

The first TPNW Review Conference, 30 November to 4 December 2026 at United Nations Headquarters in New York.

30 Years of the ICJ Opinion on the Legality of the Threat or Use of Nuclear Weapons: Spotlight on the Environment

On 8 July 1996, the International Court of Justice (ICJ) rendered its Advisory Opinion on the Legality of the Threat or Use of Nuclear Weapons. Thirty years on, international law and new science have shifted in the last three decades, and technological and geopolitical risks have also emerged.

The Lex Mundi Nova webinar series, convened by Horizon 2045 together with the Geneva Graduate Institute and IPPNW Geneva Liaison Office, on The ICJ Advisory Opinion on the Legality of the Threat or Use of Nuclear Weapons 30 Years On: What Legacy and What Now? launched last month examines the 1996 ruling itself, and the changes that have occurred since. The series explores whether the ambiguities and gaps in the 1996 opinion can and should be revisited in light of today’s legal, scientific and evidentiary context. It highlights key developments since 1996 across international humanitarian law (IHL), international human rights law (IHRL), international environmental law (IEL), and the rights of future generations, against the backdrop of significant new scientific evidence of the humanitarian, environmental, and socio-economic consequences of nuclear weapons.

As highlighted in the second webinar that focused on Nuclear weapons and the protection of the environment (watch on Vimeo), while the 1996 ICJ Advisory Opinion acknowledged the relevance of IEL, it merely concluded that IEL “indicates important environmental factors that are properly to be taken into account” when implementing IHL. Three decades on, however, the considerable development of IEL, alongside strengthened provisions within IHL for environmental protection in armed conflict, raises important questions about how these advances further constrain the legality of nuclear weapons. Experts underscored the scale of the risk, noting that approximately 12,500 nuclear weapons remain globally, with around 3,000 deployed, including in or near major urban centres. They presented the impacts of a nuclear war on the climate and on the global food supply, and looked at the use of nuclear weapons under the lens of IEL and IHL. With the evolution of scientific modelling, and the ICJ’s clear signal that science must be the basis of law, especially when it comes to the environment and climate, there is an increasing degree of foreseeability, which only makes nuclear weapons that much more deterred under the international regime. Key developments in the past decade include:

• The adoption of the United Nations International Law Commission’s principles on protection of the environment in relation to armed conflict. In resolution 77/104 of 7 December 2022, the UN General Assembly took note of the principles.
• The adoption of the Treaty on the Prohibition of Nuclear Weapons (TPNW) in 2020 and its entry into force in 2021.

Two resolutions adopted recently tasked the production of important reports looking into the environmental impacts of nuclear weapons:

• Under resolution A/RES/79/238 ‘Nuclear war effects and scientific research’, adopted on 24 December 2024, the United Nations General Assembly decided to establish an independent Scientific Panel on the Effects of Nuclear War. The Panel has been tasked with examining ‘the physical effects and societal consequences of a nuclear war on a local, regional and planetary scale, inter alia, the climatic, environmental and radiological effects, and their impacts on public health, global socioeconomic systems, agriculture and ecosystems, in the days, weeks and decades following a nuclear war.’ It will produce a comprehensive report, make key conclusions, and identify areas requiring future research. The report will be submitted to the eighty-second session of the General Assembly, in 2027. The resolution calls upon the United Nations system and relevant agencies, including WHO, WMO and UNEP, to support the work of the Panel, including by contributing expertise, commissioned studies, data and papers.
• Under resolution WHA78.28 ‘Effects of nuclear war on public health’ adopted in 2025, the World Health Assembly requested WHO Director-General to update the reports “Effects of nuclear war on health and health services” of 1983 and 1987, and the report “Health and environmental effects of nuclear weapons” of 1993, cooperating with relevant stakeholders and other United Nations bodies and international organizations, and to report on progress in the implementation of this resolution to the WHA82 in 2029.

World Days

29 August | International Day against Nuclear Tests

Since nuclear weapons testing began on 16 July 1945, over 2,000 have taken place. In the early days of nuclear testing little consideration was given to its devastating effects on human life and the environment. On 2 December 2009, the 64th session of the UN General Assembly declared 29 August the International Day against Nuclear Tests by unanimously adopting resolution 64/35. The resolution calls for increasing awareness and education “about the effects of nuclear weapon test explosions or any other nuclear explosions and the need for their cessation as one of the means of achieving the goal of a nuclear-weapon-free world.”

Commemoration in Geneva

The Permanent Mission of Kazakhstan to the UN Office in Geneva organizes an annual commemoration event on International Day Against Nuclear Tests to commemorate the closure of Kazakhstan’s test site & other test sites globally.

26 September | International Day for the Total Elimination of Nuclear Weapons

The United Nations commemorates 26 September as the International Day for the Total Elimination of Nuclear Weapons. This Day is an occasion for the world community to reaffirm its commitment to global nuclear disarmament as a priority and provides an opportunity to educate the public – and their leaders – about the real benefits of eliminating such weapons, and the social and economic costs of perpetuating them. It also addresses one of humanity’s greatest challenges, achieving the peace and security of a world without nuclear weapons.

Treaty on the Prohibition of Nuclear Weapons and the Environment

On 7 July 2017, Member States adopted a landmark global agreement to ban nuclear weapons, known officially as the Treaty on the Prohibition of Nuclear Weapons (TPNW), and entered into force on 22 January 2021. To date, there are currently 92 signatories and 68 states parties to the treaty.

The treaty includes a comprehensive set of prohibitions on participating in any nuclear weapon activities. These include undertakings not to develop, test, produce, acquire, possess, stockpile, use or threaten to use nuclear weapons. With well-documented evidence of the environmental and ecological brought about by the use of nuclear weapons, the Treaty also obliges States parties to provide adequate assistance to individuals affected by the use or testing of nuclear weapons, as well as to take necessary and appropriate measure of environmental remediation in areas under its jurisdiction or control contaminated as a result of activities related to the testing or use of nuclear weapons.

Vienna Action Plan

At the First Meeting of States Parties to the Treaty on the Prohibition of Nuclear Weapons in 2021, States parties adopted the Vienna Action Plan, with 50 concrete and progressive actions to implement the treaty and work towards a world free of nuclear weapons. The States parties also adopted the “Vienna Declaration” reaffirming their determination to realize the complete elimination of nuclear weapons.

The Vienna Action Plan created three informal working groups to take forward actions related to Articles 4, 6 and 7 and 12 of the treaty, as well as focal points or facilitators to advance actions on gender and complementarity of the TPNW with other instruments. The Vienna Action also commits states to appoint national focal or contact points for work on these Articles.

In particular, Articles 6 and 7 relate to Victim Assistance, Environmental Remediation and International Cooperation, which requires states parties to provide victim assistance and environmental remediation to individuals and areas under their jurisdiction or control affected by the use or testing of nuclear weapons, and for states parties with capacity to provide assistance to others. → Consult the updates provided by ICAN on the ongoing work of the Working Group.

Human Rights Implications of Nuclear Testing

Since nuclear weapons testing began on 16 July 1945, over 2,000 have taken place. In the early days of nuclear testing little consideration was given to its devastating effects on human life, let alone the dangers of nuclear fallout from atmospheric tests. Hindsight and history have shown us the terrifying and tragic effects of nuclear weapons testing, especially when controlled conditions go awry, and in light of the far more powerful and destructive nuclear weapons that exist today.

The toxic nuclear waste and the nuclear radiation and contamination brought about by nuclear testing poses serious threats to the environment and people living in and around nuclear test sites, and continues to have an adverse impact on their human rights, to hinder the full realization and enjoyment of human rights, inter alia, the rights to life, to the enjoyment of the highest attainable standard of physical and mental health, to an adequate standard of living, to adequate food, to housing, to safe drinking water and sanitation, and to participation in cultural life, and their enjoyment of a clean, healthy and sustainable environment, for present and future generations.

Nuclear Legacy in the Marshall Islands

Such was the case in the Marshall Islands, where between 1946 and 1958, 67 known nuclear weapons were tested in the Marshall Islands while it was under United Nations trusteeship. The former UN Special Rapporteur on toxics and human rights, Calin Georgescu, on his mission to the Marshall Islands (A/HRC/21/48/Add.1), reported that the nuclear testing in the Marshall Islands had immediate and continuing effects on human rights that resulted in fatalities and serious health complications, and that the radiation had led to environmental contamination and the loss of livelihoods and lands. He reported that people in the Marshall Islands continued to suffer the adverse effects of radiation from nuclear tests, resulting in elevated levels of cancer, birth defects and psychological trauma that continue to this day, and that Marshallese women and girls suffered disproportionately from thyroid and other cancers and from reproductive health problems

Recognizing the need to realize the right to a clean, healthy and sustainable environment of people in the Marshall Islands, the UN Human Rights Council has adopted the resolution (A/HRC/RES/51/35), « Technical assistance and capacity-building to address the human rights implications of the nuclear legacy in the Marshall Islands ». Since then, the Office of the High Commissioner for Human Rights (OHCHR) has provided technical assistance and capacity-building to the National Nuclear Commission of the Marshall Islands in advancing its national strategy for nuclear justice and determining its technical assistance and capacity-building needs to pursue transitional justice in its efforts to address the legacy of nuclear testing in the Marshall Islands. Reports include:

• A/HRC/57/77 | Addressing the challenges and barriers to the full realization and enjoyment of the human rights of the people of the Marshall Islands, stemming from the State’s nuclear legacy | Office of the United Nations High Commissioner for Human Rights
• A/HRC/63/76 | Addressing the challenges and barriers to the full realization and enjoyment of the human rights of the people of the Marshall Islands stemming from the State’s nuclear legacy | Office of the United Nations High Commissioner for Human Rights

Commemoration in Geneva

On 28 September 2026, a dedicated screening of the documentary “67 Bombs to Enid” will take place to commemorate 80 years since the first nuclear weapons test in the Marshall Islands, on the occasion of the International Day for the Total Elimination of Nuclear Weapons, observed every 26 September. An enhanced interactive dialogue on the second report will also take place at the 63rd session of the Human Rights Council.

The Role of Geneva

Conference on Disarmament (CD)

The Conference on Disarmament (CD), established in 1979, is the single multilateral disarmament negotiating forum of the international community, following the first Special Session on Disarmament (SSOD I) of the United Nations General Assembly held in 1978. The Director-General of the United Nations Office in Geneva (UNOG) is the Secretary-General of the Conference on Disarmament as well as the Personal Representative of the UN Secretary-General to the CD.

It succeeded other Geneva-based negotiating fora such as the Ten-Nation Committee on Disarmament (1960), the Eighteen-Nation Committee on Disarmament (1962-68), and the Conference of the Committee on Disarmament (1969-78).

The terms of reference of the CD include practically all multilateral arms control and disarmament problems. Currently, the CD focuses on the following issues:

• Cessation of the nuclear arms race and nuclear disarmament
• Prevention of nuclear war, including all related matters
• Prevention of an arms race in outer space
• Effective international arrangements to assure non-nuclear-weapon States against the use or threat of use of nuclear weapons
• New types of weapons of mass destruction and new systems of such weapons including radiological weapons
• Comprehensive programme of disarmament and transparency in armaments
• Verification of nuclear disarmament

The CD and its predecessors have negotiated major multilateral arms limitation and disarmament agreements such as:

• Treaty on the Non-Proliferation of Nuclear Weapons
• Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques
• Treaty on the Prohibition of the Emplacement of Nuclear Weapons and Other Weapons of Mass Destruction on the Sea-Bed and the Ocean Floor and in the Subsoil thereof
• Convention on the Prohibition of the Development, Production and Stockpiling of Bacteriological (Biological) and Toxin Weapons and on their Destruction
• Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on Their Destruction and Comprehensive Nuclear-Test-Ban Treaty

International Campaign to Abolish Nuclear Weapons (ICAN)

Also based in Geneva is the International Campaign to Abolish Nuclear Weapons (ICAN), a coalition of non-governmental organizations in 100 countries promoting adherence to and implementation of the United Nations nuclear weapon ban treaty. This landmark global agreement was adopted in New York on 7 July 2017. ICAN also won the Nobel Peace Prize in 2017.

Other Disarmament Meetings

In addition, Geneva occasionally hosting other meetings related to disarmament and non-proliferation instruments such as certain sessions of the Advisory Board on Disarmament Matters, and certain sessions of the Preparatory Committee of the Review Conferences of the Nuclear Non-Proliferation Treaty (NPT), expert panels and seminars.

Ecological Impact

Since the early development of nuclear technology it has been clear that there are strong links between civil and military applications of nuclear power. However, the deployment of nuclear power and related technologies has been highly controversial, with among the key concerns the ecological impacts of nuclear accidents and the radioactive waste disposal. Scientists and anti-nuclear activists warn of the dangers of the radiation released during every stage of a nuclear weapon production and eventual detonation, referring to reports from workers of nuclear power stations and the survivors of the Chernobyl and Fukushima disasters.

Land

Isotopes released during a meltdown or related event are typically dispersed into the atmosphere and then settle to the surface through natural occurrences and deposition. Isotopes settling in the top soil layer can remain there for many years as a result of the half-life of said particles involved in nuclear events. Due to the long term detrimental affects on agriculture, farming and livestock, it carries further potential to affect human health and safety long after the actual event.

Fukushima Daiichi 2011

After the Fukushima Daiichi accident in 2011, surrounding agricultural areas has been contaminated with more than 100,000 MBq km−2 in cesium concentrations. As a result, eastern Fukushima food production saw massive limitations. Due to the topographical nature of Japan, as well as the weather pattern for the prefecture, cesium deposits as well as other isotopes reside in top layer of soils all over eastern and northeastern Japan.

Chernobyl 1986

The Chernobyl disaster in 1986 caused approximately 125,000 mi2 of land across the Ukraine, Belarus and Russia to be exposed to radiation. The amount of focused radiation caused severe damage to plant reproduction, resulting in most plants being unable to reproduce for a minimum of three years. Many of these occurrences on land can be a result of the distribution of isotopes through water systems.

Water

Fukushima Daiichi 2011

In 2013, contaminated groundwater was found in-between some of the affected turbine buildings in the Fukushima Daiichi facility, including locations at bordering seaports that led into the Pacific Ocean. In both locations, the facility typically expulses clean water to feed into further groundwater systems. The Tokyo Electric Power Company (TEPCO), the entity that manages and operates the facility, further investigated the contamination in areas that would deem safe to conduct operations. They found that a significant amount of the contamination originated from underground cable trenches that connected to circulation pumps within the facility. Both the International Atomic Energy Agency (IAEA) and TEPCO confirmed that this contamination was a result of the 2011 earthquake. Due to damages like these, the Fukushima plant released nuclear material into the pacific ocean and has continued to do so. After five years of leaking, the contaminates reached all corners of the pacific ocean from North America, to Australia, to Patagonia. Along the same coastline, Woods Hole Oceanographic Institute (WHOI) found trace amounts of Fukushima contaminates 100 miles (150 km) off of the coast of Eureka, California in November 2014. Despite the relative dramatic increases in radiation, the contamination levels still fall below the World Health Organization’s (WHO) standard for clean drinking water.

In 2019, the Japanese government announced that it was considering the possibility to dump contaminated water from the Fukushima reactor into the Pacific Ocean. Japanese Environmental Minister Yoshiaki Harada reported that TEPCO had collected over a million tons of contaminated water, and by 2022 they would be out of space to safely store the radioactive water.

Multiple private agencies as well as various North American governments monitor the spread of radiation throughout the pacific to track the potential hazards it can introduce to food systems, groundwater supplies, and ecosystems. In 2014, the United States Food and Drug Administration (FDA) released a report stating that radionuclides, traced from the Fukushima facility, were present in the United States food supply, but not to levels deemed to be a threat to public health – as well as any food and agricultural products imported from Japanese sources. It is commonly believed that, with the rate of the current radionuclide leakage, the dispersal into the water would prove beneficial as most of the isotopes would dilute into the water as well as become less effective over time, thanks to radioactive decay. Cesium (Cs-137) is the primary isotope released from the Fukushima Daiichi facility.

Chernobyl 1986

Evidence can be seen from the 1986 Chernobyl event. Due to the violent nature of accident in Chernobyl, a sizable portion of radioactive contamination resulted from the atmosphere were particles what where dispersed during the explosion. Many of these contaminates settled in groundwater systems in immediate surrounding areas, but also Russia and Belarus. Due to the resulting radiation in groundwater, the ecological effects of the disaster can be seen in various aspects down the environmental process line. Radionuclides carried by groundwater systems in and around the areas of Chernobyl have resulted in the uptake to plants in the region and up the food chains into animals, and eventually, humans – as one of the largest exposure points of radiation was through agriculture contaminated by radioactive groundwater. Again, one of the largest concerns to the local populaces within the 30 km exclusion zone is the intake of Cs-137 through the consumption of agricultural products contaminated with groundwater. Comparatively, thanks to the environmental and soil conditions outside the exclusion zone, the recorded levels are below those that require remediation based on a survey in 1996. During this event, the groundwater transportation of radioactive material carried over borders in to neighboring countries. Belarus, lying to Chernobyl’s northern border, was subject to approximately 250,000 hectares of previously usable farmland being held by state officials until deemed safe.

Off-site radiological risk may be found in the form of flooding. Many citizens in the surrounding areas have been deemed at risk of exposure to radiation due to the Chernobyl Reactor’s proximity to floodplains. A study conducted in 1996 was conducted to see how far the radioactive effects were felt across eastern Europe. Lake Kojanovskoe in Russia, 250 km from the Chernobyl accident site, was found to be one of the most impacted lakes traced from the disaster area. Fish collected from the lake were found to be 60 times more radioactive than the European Union Standard. Further investigation found that the water source feeding the lake provided drinking water for approximately 9 million Ukrainians, as well as provided agricultural irrigation and food for 23 million more.

A cover was constructed around the damage reactor of the Chernobyl nuclear plant. This helps in the remediation of leaking radioactive material from the site of the accident, but does little to help aid the local area with isotopes that were dispersed in its soils and water ways more than 30 years ago. Partially due to the already abandoned urban areas, as well as international relations currently affecting the country, remediation efforts have minimized compared to the initial clean up actions and more recent accidents such as the Fukushima incident.

Depleted Uranium

Depleted uranium (DU) is the main by-product of uranium enrichment and is a chemically and radiologically toxic heavy metal; it is mildly radioactive, with about 60% of the activity of natural uranium. This dense metal is used in munitions for its penetrating ability and as a protective material in armoured vehicles.

In the wake of conflicts in the 1990s, increased attention has been paid to the possible health and environmental effects of the use of armaments and ammunitions containing DU. The General Assembly first addressed the matter in 2007 and, since 2008, has taken it up on a biennial basis.

Various international organizations, including the WHO and UNEP, have undertaken studies on the potential effects of DU on human beings and the environment. The health effects resulting from DU exposure depend on the route and magnitude of exposure and the characteristics of the DU, such as particle size, chemical form and solubility. Where DU munitions have been used, DU penetrators, penetrator fragments and jackets/casings can be found lying on the surface or buried at varying depth. When DU penetrators hit a target’s surface target or the ground, only a small percentage of the penetrator’s mass will transform to DU dust. Air, soil, water and vegetation can potentially be contaminated and affected by DU residues.

From 1999 to 2003, UNEP conducted environmental assessments and measurements on targeted DU sites in Kosovo, Serbia and Montenegro, and Bosnia and Herzegovina. Additionally, based on the findings of the 2003 UNEP Desk Study on the Environment in Iraq, UNEP initiated a DU project in Iraq.

Resources

• Stories from Hiroshima and Nagasaki | UN News | 7 September 2021
• Nuclear Weapons | UN Disarmament
• U.S., Russia Agree to Strategic Stability Dialogue | Kingston Reif and Shannon Bugos | Arms Control Association | July/August 2021
• Conference on Disarmament Holds Thematic Plenary Discussion on Nuclear Disarmament Verification | UN News | 11 May 2021
• UN treaty banning nuclear weapons set to enter into force in January | UN News | 25 October 2020
• We must not forget that prohibiting nuclear weapons is the beginning – not the end – of our efforts | ICRC | 25 October 2020
• Helping small states have a big say in nuclear disarmament | Jessica Alexander | Geneva Solutions | 29 September
• Former world leaders urge ratification of nuclear arms ban treaty | New York Times | 20 September 2020
• How Chernobyl has become an unexpected haven for wildlife | UNEP | 16 September 2020
• ‘Urgent need’ to stop erosion of nuclear order, major UN disarmament forum hears | UN News | 13 August 2020
• Young people have a major role to play in ridding the world of nuclear weapons | UN News | 10 August 2020
• UN Secretary-General’s message to Nagasaki Peace Memorial Ceremony on the 75th Anniversary of the Atomic Bombing of Nagasaki | UN News | 9 August 2020
• 75 years after the bomb, Hiroshima still chooses ‘reconciliation and hope’ | UN News | 6 August 2020
• Nuclear testing legacy is ‘cruellest’ environmental injustice, warns rights expert | UN News | 16 July 2020
• Prospect of a nuclear war higher than it has been in generations, warns UN | UN News | 2 April 2019
• The Chernobyl disaster may have also built a paradise | WIRED | 2019
• Military Nuclear Accidents: Environmental, Ecological, Health and Socio-economic Consequences | Wiley | November 2018
• Legality of the Threat or Use of Nuclear Weapons | International Court of Justice