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More than one billion tonnes of food disappears every year into bins, drains and decomposing piles — enough, the United Nations says, to feed every hungry person on earth several times over — as the world marked International Day of Zero Waste on Monday with renewed urgency about a crisis that is simultaneously an environmental catastrophe, an economic haemorrhage and a moral failure of stunning proportions.
The scale of what is being thrown away defies easy comprehension. One in five units of food available to consumers globally is wasted before it reaches a mouth. An additional 13 percent is lost between harvest and the retail shelf, disappearing into inefficient storage, inadequate transportation and broken cold chains before a consumer ever has the chance to waste it. Together, food loss and waste account for between eight and ten percent of all global greenhouse gas emissions — and food waste alone generates up to 14 percent of methane releases, a gas whose short-term warming effect dwarfs carbon dioxide by a significant multiple.
The global economy pays approximately $1 trillion annually for this waste. That figure, cited by UNEP Executive Director Inger Andersen in her remarks marking the day, captures only the direct economic cost — the value of the food itself, the land, water, energy and labour that produced it, and the resources spent managing what remains. It does not capture the cost of the hunger that persists while the food rots, or the climate damage accumulating from methane released by decomposing organic waste in landfills around the world.
“In a time of accelerating climate change and rising food prices, we cannot afford to waste precious resources to grow food that is not eaten,” Andersen said.
The numbers on hunger sit alongside the numbers on waste in a combination that should be impossible to accept as normal. Hundreds of millions of people face food insecurity globally. The UN estimates that households alone discard more than one billion meals every single day. The two realities — mass hunger and mass waste — coexist not because there is not enough food in the world, but because the systems moving food from production to consumption are broken in ways that no amount of additional agricultural output alone will fix.
UN Secretary-General António Guterres used the day’s observance to issue what has become a familiar but still necessary appeal for action at every level. Consumers can change shopping and cooking habits. Governments and businesses must deploy systemic solutions at scale. Neither alone is sufficient. The household sector accounts for 60 percent of all food waste globally, followed by food service at 28 percent and retail at 12 percent — a distribution that makes consumer behaviour central to any serious reduction strategy while also confirming that the environments in which consumers make decisions are shaped by systems they do not control.
This year’s Zero Waste Day observance, jointly facilitated by UNEP and UN-Habitat, focused specifically on food waste within the broader context of the 2.3 billion tonnes of municipal solid waste the world generates annually. The framing reflects a recognition that food waste is not a niche environmental concern but a thread running through climate, food security, public health and economic stability simultaneously — a leverage point where action in one domain produces compounding gains across several others.
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The moral dimension was put plainly by Emine Erdoğan, the First Lady of Türkiye, whose remark cut to the ethical core of the issue. “In every wasted bite lies the right of someone whose life depends on it,” she said. It is the kind of statement that risks sounding like rhetoric until you hold it next to the data — one billion meals thrown away daily, hundreds of millions going hungry — at which point it stops being rhetoric and becomes arithmetic.
Some countries have demonstrated that meaningful progress is achievable with genuine political commitment. Japan has reduced food waste by 53 percent through a combination of strong policy frameworks and deep public-private collaboration. The United Kingdom has achieved a 22 percent reduction through similar means. Both examples point to what is possible when governments treat food waste reduction as a policy priority rather than an aspirational footnote.
For Nigeria, the issue carries particular urgency and particular difficulty. Post-harvest losses are substantial across the country’s agricultural value chain, driven by inadequate storage infrastructure, an unreliable cold chain, poor rural road networks and a wholesale market system not designed for efficiency. Analysts note that reducing food loss and waste in Nigeria could meaningfully improve food availability without requiring increases in production — an important distinction in an environment where farmers are already under pressure from rising input costs, insecurity in farming communities and climate variability that is making planting calendars less predictable.
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The path forward for Nigeria and comparable developing economies, experts say, runs through data collection, cold storage investment, logistics reform and public awareness — none of which are glamorous, all of which require sustained political attention and financing that tends to flow toward more visible priorities.
The global target of halving food waste by 2030 is six years away. On current trajectories, the UN acknowledges, it will not be met. The gap between what is known about the problem and what is being done about it remains the defining characteristic of a crisis whose solution exists in principle and eludes us in practice.
