UNEP: Rotting food waste emits 5 times more greenhouse gases than aviation

October 4, 2026 at 07:00 AM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

Rotting food waste causes up to 10% of global greenhouse gas emissions, five times more than the entire aviation sector, the UN Environment Programme warned this week. The agency said decomposing food in landfills is a major driver of methane, which traps 86 times more heat than CO2 over 20 years. The warning comes as more than one billion meals are left uneaten daily, with 60% of that waste coming from households.

Key Facts

Rotting food waste causes up to 10% of total global greenhouse gas emissions, five times more than the entire aviation sector.
Methane from decomposing food traps 86 times more heat than carbon dioxide over a 20-year period.
More than one billion meals are left uneaten every day, with 60% of that waste coming from households.
The FAO estimates that 1.4 billion hectares of land, or 28% of the world's agricultural land, is used to produce food that is never eaten.
Municipal solid waste landfills are the third largest source of human-related methane emissions in the United States.

Methane Emissions

When organic matter such as uneaten food is buried in landfills and deprived of oxygen, it interacts with micro-organisms to produce methane. Methane is currently responsible for nearly one third of global warming and traps 86 times more heat than carbon dioxide over a 20-year period. Decomposing food is one of the main drivers of methane emissions worldwide. In the United States, municipal solid waste landfills are the third largest source of human-related methane emissions.

Scale of Food Waste

Every day, more than one billion meals are left uneaten, according to a UNEP report. Sixty per cent of this discarded food comes from households. The FAO estimates that 1.4 billion hectares of land, or around 28% of the world's agricultural land, is used to produce food that is never eaten. Agricultural expansion remains a leading cause of deforestation, so food waste contributes to cutting down trees that can no longer pull carbon dioxide out of the atmosphere.

Climate Solutions

Methane from rotting food waste is short-lived and breaks down much faster in the atmosphere than carbon dioxide. Cutting methane emissions today can produce climate benefits within decades. UNEP official Martin Krause said tackling food waste may be one of the most immediate and cost-effective climate solutions available.