Nuclear energy—accident—bomb. For many people, that is the sequence that comes to mind when they hear the word “nuclear”. Decades of dramatic headlines and historic events have shaped our understanding of the atom in frightening ways.

Yet there is another story—quieter, less visible, and hopeful. Beyond political debates, nuclear science is helping to address some of the world’s most pressing environmental challenges, from water scarcity and food security to the consequences of climate change and pollution.

Low-Carbon Water Desalination

For millions of people, reliable access to drinking water is not guaranteed. Coastal cities and island nations increasingly rely on desalination to supply their populations. The problem is that most desalination plants are energy-intensive and rely on fossil fuels, producing large amounts of carbon dioxide while solving water shortages. Nuclear energy offers a cleaner alternative. Nuclear reactors generate heat and electricity, both of which can be used for desalination. Reactor heat can drive thermal desalination processes in which seawater evaporates, leaving salt behind and making the remaining water safe to drink. Electricity from the plant can power reverse-osmosis systems that push seawater through membranes to produce drinking water. At the Madras Atomic Power Station in India, a hybrid nuclear desalination plant produces around 6,300 m³ of potable water a day, supplying nearby industry and communities while demonstrating that clean energy and clean water can come from the same source.

Seed Mutation Breeding

Agriculture is another area where nuclear science is contributing to sustainability. Feeding a growing population requires producing more food with decreasing amounts of land, water, and fertilisers. One approach is plant mutation breeding. In this process, scientists expose seeds to controlled radiation to induce genetic changes that normally take decades to occur naturally. Most mutations have little effect, but some create higher yields, improved disease resistance, or greater tolerance to drought. In Bangladesh, nuclear-derived rice varieties developed using these techniques have increased yields by roughly 10-15%. In a country where rice is the staple food for more than 160 million people, such improvements significantly strengthen food security. Countries such as China, India, Japan, Vietnam, Pakistan, Indonesia, Thailand, Bangladesh, Argentina, and Brazil have successfully applied these nuclear techniques to develop improved crop varieties that are more productive, resistant to pests and diseases, and better adapted to local environmental conditions.

Pest Control

Another unexpected application of nuclear science in agriculture is pest control. The Sterile Insect Technique offers a way to reduce pest populations without widespread pesticide use. Male insects are sterilised using radiation and then released into the wild. When they mate with wild females, no offspring are produced, and the population gradually declines. This method has successfully controlled the Mediterranean fruit fly in Mexico, protecting fruit production and reducing reliance on chemical pesticides. The same technique has proven to be a potential for use by European cities. In collaboration with the International Atomic Energy Agency (IAEA), the city of Graz in Austria conducted a pilot project using radiation-sterilised male Asian tiger mosquitoes, resulting in about 70% sterility in mosquito eggs. Plans to implement this technique for the upcoming mosquito season in 2026 are currently being developed.

Environmental Monitoring

In addition to these surprising applications, nuclear science also plays a crucial role in environmental monitoring. Isotopes allow scientists to observe natural systems in remarkable detail. In water management, stable and radioactive isotopes act like fingerprints to reveal where groundwater originates, how long it has been underground, and whether it has been contaminated. These techniques have helped researchers study one of the largest underground water reserves in the world, the vast Nubian Sandstone Aquifer beneath North Africa, supporting efforts to manage resources sustainably across Egypt and Sudan. It also helps farmers manage resources more efficiently. Scientists can use isotopic tracers (special forms of atoms that act like markers) to follow how water and nutrients move through soil and plants. By tagging irrigation water or fertilisers with these tracers, researchers can see whether crops are absorbing or losing them to runoff. This allows farmers to adjust irrigation and fertilisation practices so that crops receive exactly what they need. The results are incredible: less wasted water, reduced fertiliser use, and fewer nutrients washing into rivers and lakes.

Lastly, isotope techniques help scientists monitor ocean changes. The seas absorb roughly a quarter of the carbon dioxide produced by human activities. While this slows climate change, it also causes ocean acidification, which threatens coral reefs, shellfish, and entire marine ecosystems. By analysing subtle changes in carbon isotopes, researchers track how carbon moves through the ocean and detect early signs of chemical changes long before visible damage occurs. This information further allows scientists and policymakers to take early action, such as reducing emissions or adjusting conservation strategies to protect vulnerable marine environments.

The world is facing overlapping environmental crises. No single technology can solve these challenges alone, but nuclear science is already part of the solution. Perhaps it is time to see the atom not only as a source of energy, but also as an ally in protecting the planet through the efforts of international organizations like the IAEA, the Food and Agriculture Organization, and laboratories working towards our common sustainable future. Let us recognise the green side of the atom and begin to associate nuclear energy with innovation, sustainability, and environmental solutions.

Written by Adelina Goriukova, Edited by Hannah Shaffer

Photo Credit: “A lush green field with a house in the middle“ by Pervez Robin (uploaded 2023, January 1) on Unsplash.