Acid shortage threatens global food security

The move away from fossil fuels has sparked a surge in demand for sulfuric acid, with warnings that a shortfall of millions of tonnes will put food production in serious risk.

Research by University College London (UCL has warned a projected shortage of sulfuric acid, a crucial chemical in modern industrial society, could stifle green technology advancement and threaten global food security.

The study found that global demand for sulfuric acid is set to rise significantly from “246 to 400 million tonnes” by 2040 – a result of more intensive agriculture and the world moving away from fossil fuels.

The researchers estimate that this will result in a shortfall in annual supply of between 100 and 320 million tonnes – between 40% and 130% of current supply – depending on how quickly decarbonisation occurs.

The study’s said authors suggest that unless action is taken to reduce the need for this chemical, a massive increase in environmentally damaging mining will be required to fill the resulting resource demand.

Study lead author, professor Mark Maslin (UCL Geography), said: “Sulphur shortages have occurred before, but what makes this different is that the source of the element is shifting away from being a waste product of the fossil fuel industry.

“What we’re predicting is that as supplies of this cheap, plentiful, and easily accessible form of sulphur dry up, demand may be met by a massive increase in direct mining of elemental sulphur. This, by contrast, will be dirty, toxic, destructive, and expensive.”

A vital part of modern manufacturing, sulfuric acid is required for the production of phosphorus fertilisers that help feed the world, and for extracting rare metals from ores essential to the rapidly required green economy transition, like cobalt and nickel used in high-performance Li-ion batteries.

Currently, over 80% of the global sulphur supply is in the form of sulphur waste from the desulphurisation of crude oil and natural gas that reduces the sulphur dioxide gas emissions that cause acid rain. However, decarbonisation of the global economy to deal with climate change will significantly reduce the production of fossil fuels – and subsequently the supply of sulphur.

Maslin added: “Research is urgently needed to develop low-cost, low environmental impact methods of extracting large quantities of elemental sulphur from the abundant deposits of sulphate minerals in the Earth’s crust. The international community should consider supporting and regulating sulphur mining to minimise the impacts of the transition and also to avoid cheap unethical production from distorting the market.”

Study co-author Simon Day (UCL Institute for Risk & Disaster Reduction) added: “Our concern is that the dwindling supply could lead to a transition period when green tech outbids the fertiliser industry for the limited more expensive sulphur supply, creating an issue with food production particularly in developing countries.”

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