Beyond the explosion

On August 4, 2020, nearly 2,750 tonnes of improperly stored ammonium nitrate exploded in the seaport in Beirut, killing more than 200 people, injuring more than 6,000, and displacing thousands from their homes. As Beirut residents still await answers from the official investigation, it is important not to brush aside this incident as the product of exceptional circumstances.

The widespread use of ammonium nitrate makes similar deadly explosions quite possible across the world. Equally concerning is the significant role this chemical plays in environmental degradation and climate change, which is also deadly. That is why it is crucial that the international community takes action beyond aiding the Lebanese authorities in the aftermath of the explosion.

Ammonium nitrate is an odourless substance that is commonly used to make fertiliser and explosives. Nitrogen fertiliser production accounts for nearly 1.2 percent of global primary energy demand, generates pollutants like fine dust, nitric acid emissions, and produces wastewater that may contain phosphorus, fluorides, ammonia, carbon dioxide, or weak acids. About 80 percent of manufactured ammonium nitrate is used for fertiliser, particularly in the global agro-industrial system.

Nitrogen is essential for plant growth. Ammonium nitrate fertiliser gained popularity after World War II as an inexpensive source of plant nutrients. Plants can more easily absorb synthetic fertiliser than naturally occurring nitrogen in the soil. The widespread use of nitrogen-based fertilisers has increased crop yields. However, fertiliser overuse has depleted naturally-occurring nutrients in the soil, making the agro-industrial system reliant on fertilisers to support its productivity.

The overreliance on external inputs, such as ammonium nitrate, also comes at the expense of the health of farmworkers and consumers, the environment, and our climate.

Nitrogen-rich fertilisers are a key source of ammonia emissions, which combine with other air pollutants to form fine particulate matter. Particulate matter exposure can cause heart and pulmonary disease and has been linked to thousands of premature deaths in rural farming communities. Direct chemical exposure is especially harmful to farmworkers who regularly come into contact with fertilisers and other inputs. Ammonium nitrate and its production also contribute to global warming. The use of nitrogen fertilisers, along with manures and other agricultural sources, accounts for nearly 60 percent of nitrous oxide emissions. Nitrous oxide is a powerful greenhouse gas that can trap heat 300 times more than carbon dioxide, contributing to rising global temperatures.

Nutrients that are not absorbed by the soil or plants contaminate water sources, which is harmful to aquatic life. A visible expression of this disturbance is the annual dead zones in the Gulf of Mexico and the Gulf of Oman. Dead zones are caused by eutrophication, which happens when a body of water is contaminated by excess nutrients. Eutrophication increases algal growth, depletes oxygen in the water, and results in an environment where marine life cannot survive.

Additionally, the widespread overreliance on synthetic fertiliser is disrupting the Earth’s natural nitrogen cycle, which is one of Earth’s nine planetary boundaries. Planetary boundaries define the safe operating spaces for humanity, which, once crossed, can cause irreversible environmental damage that may have disastrous repercussions for our current way of life.

Excerpted: ‘Beyond the Beirut explosion: The many dangers of ammonium nitrate’

Aljazeera.com