In the event of a major disaster such as nuclear war or a super volcanic eruption, Earth could face a drastic reduction in sunlight, threatening global agriculture and food supplies. A team of international researchers, led by David Denkenberger of the University of Canterbury, UK, suggests seaweed as a resilient alternative to traditional crops in such scenarios.
Their research, published in the journal Earth’s Future, [1] presents algae as a versatile, nutrient-rich food source that could thrive even in post-apocalyptic conditions.
Research results on the potential of seaweed
The study conducted simulations based on the seaweed species Tikvahia leans, commonly known as graceful red grass, using climate data relating to potential nuclear winters. The results showed that algae could meet up to 45% of global human food demand in the 9-14 months following the disaster, using only a small portion of the world‘s oceans.
This growth is also feasible in tropical oceans following a major nuclear conflict. Cheryl Harrison, assistant professor at Louisiana State University and co-author of the study, highlights the urgent need for alternative food sources, citing the serious consequences of nuclear war on agriculture.
Impact of nuclear war on global agriculture
The study delves into the historical context, recalling the devastation caused by the atomic bomb dropped on Hiroshima in 1945. It highlights the immediate dangers of nuclear war, such as incineration and radiation poisoning. Even more significantly, it sheds light on the long-term threat of a nuclear winter, in which sunlight is blotted out, leading to a catastrophic reduction in global agricultural production.
This could result in widespread famine and billions of deaths, making the exploration of alternative food sources such as algae critically important.
Challenges and implications
While seaweed emerges as a promising solution, the study recognizes several challenges in its large-scale cultivation after the disaster. The main obstacle is the rapid construction of algae farms. The research suggests the possibility of using low-tech agricultural methods and prioritizing regions with the highest growth potential. However, we also recognize the need for further research to explore the feasibility of such large-scale operations and their impact on marine ecology.
The study concludes by highlighting the need for proactive measures to improve seaweed cultivation capabilities, thereby strengthening global food security against potential future disasters.
Notes and insights
Seaweed as a Resilient Food Solution After a Nuclear War – Jehn – 2024 – Earth’s Future (DOI: 10.1029/2023EF003710)
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