Solar-powered cold storage can reduce food wastage and empower women

Food loss and waste are major problems confronting the world. When food is tossed aside or allowed to spoil, it makes economies less productive and leaves people hungry. It also harms earth's climate by generating methane, a potent greenhouse gas. Food loss and waste accounts for four per cent of global greenhouse gas emissions. Taken on a larger picture, if the amount of food waste were a country, it would be the third-largest emitter in the world, behind only China and the US. Worldwide, 1.3 billion tonnes of food are lost or wasted every year.

Earth's population is projected to increase from eight billion to roughly 10 billion by 2050.

Feeding that many people will require nations to increase agricultural production by more than 70 per cent and reduce food loss and waste. Expanding food cold chains to the world's least-developed countries can have enormous impacts. But it also raises concerns if it's not done in a way that avoids contributing to climate change. Existing refrigeration systems release hydro-chlorofluorocarbons, or HCFCs, and hydro-fluorocarbons, or HFCs, which are extremely potent greenhouse gases. Producing electricity with fossil fuels to power these systems also worsens climate change.

For these reasons, exporting traditional cold chains to developing countries is not environmentally and socially sustainable. Instead, developing countries need cold chains that run on renewable energy and use alternative refrigerants with lower climate impacts.

As a scholar focusing on sustainable development, green growth and climate change, I believe that expanding cold chains in the developing world – particularly sub-Saharan Africa – will not only benefit the environment but also provide important social benefits, such as empowering women. Spoilage and contamination: To understand why cold chains are so important, think about how food travels from the farm to your table. First it is harvested and shipped to a wholesaler. Then it might go straight to retail stores or to a food processing company to be cooked, frozen or canned. At each stage it may sit for even days together. If it is not held at a safe temperature, the food may get spoilt or be contaminated with bacteria that cause food-borne illnesses.

In 2021, over 700 million people were hungry around the world – 425 million in Asia, 278 million in Africa and 57 million in the Caribbean and Latin America. Many countries in these regions have minimal cold storage capacity to keep food from spoiling before it can be eaten. Seafood, meat, milk and vegetables are highly reliant on cold food chains. Countries mainly in the developing world lose 23 per cent of their perishable products before they reach markets.

Loss of cereal crops, which also benefit from cold storage, are equally staggering. For instance, Ethiopia loses about one-third of its stored corn after five weeks due to lack of proper storage. In 2019, India's Ministry of Food Processing Industries estimated that the country had lost or wasted 56 million tonnes of food, worth about $10 billion, mainly due to lack of cold storage facilities. Inadequate post-harvest management can lead to crop contamination and pest infestation. In Uganda, where most corn is grown by small farmers who lack proper facilities to dry and store, contamination with fungi that produce dangerous substances called aflatoxin has been a significant human and animal health concern.

Social benefits from cold storage: Nearly 150 countries have adopted the Kigali Amendment to Montreal Protocol on substances that deplete the Ozone Layer. This measure, negotiated in 2016, is driving changes in the cooling energy sector by requiring nations to phase down use of HFCs.

The global cold chain market is worth $160 billion today and is projected to touch $585 billion three years down the line. Solar-powered cold storage is a niche market today but is poised for growth. In addition to minimising food loss and waste, increasing incomes, curbing land degradation and reducing greenhouse emissions, sustainable cold storage offers great benefits for women, who produce 60 per cent to 80 per cent of crops and are responsible for post-harvest activities in most developing countries. Research in climate finance reveals that women are disproportionately burdened by poverty because they have less access to assets and financial resources compared to men in many countries. However, since women play key roles in farming and managing food supplies, they are positioned to participate in the food cold chain business in remote areas if the international community provides financial and technical support, thus improving their economic status and livelihood.

Pilot projects show promise: I see sub-Saharan Africa as an ideal candidate for introduction of food cold chains, for several reasons. First, most of its food loss and waste occurs during harvest and post-harvest stages. Installing sustainable cold chain systems at these stages can greatly reduce losses at an early point. Second, much of the region lacks food cold chains. Investing here offers the opportunity to bypass conventional systems and leapfrog straight to sustainable designs.

In my view, a bottom-up approach starting at the farm level is the most viable strategy. Notably, dairy farmers in Uganda are organized into cooperatives, which have invested in cold chain storage. This made them more resilient to commercial disruptions during the Covid-19 pandemic than other sectors, such as fish and vegetables, which suffered heavy losses when producers could not get their products to markets.

Nigeria has the highest yearly food loss and waste rate in Africa – 415 pounds (190 kilograms) per capita. In northern Nigeria, a six-month pilot project that installed solar-powered cold storage for seven small fruit and vegetable markets preserved the quality of goods and enabled markets to charge higher prices. These systems generated estimated net profits of roughly $8,000 per year per market. Even at a seven per cent annual interest rate, such a system could recoup its $40,000 capital cost within a decade. Access to electricity is as low as 55 per cent in some parts of Nigeria, and most of its electricity comes from gas and oil. Renewable-powered cold storage offers a cleaner alternative.

Other experiments have produced similar results in northwest Kenya and in Indonesia's Wakatobi islands, where 78 per cent of the population relies on fish as a staple food.

Solar-powered cold storage facilities helped these communities save money and reduce waste. To promote efficient and climate-friendly cooling, including air conditioning and refrigeration, the United Nations Environmental Programme (UNEP) organised a 'Global Cool Coalition' that includes cities, countries, businesses and international organisations.

I see this partnership as the way forward to progress on both sustainable development and climate change. In my view, investing in renewable-powered cold chains in the world's least-developed countries will significantly spur green growth, protect nature and feed the world's hungry people.