Food Waste: Why 40% of All Waste is Organic and What to Do About It

Every year, approximately 1.3 billion tonnes of food — one-third of all food produced for human consumption — is lost or wasted globally. This food is grown, harvested, processed, transported, refrigerated, cooked... and then thrown away.

If food waste were a country, its greenhouse gas emissions would make it the third-largest emitter in the world, behind only the USA and China.

And in the waste stream, organic material dominates. Globally, 40–45% of all municipal solid waste by weight is organic — food scraps, garden waste, wood, and food-soiled paper.

Understanding the Scale

The numbers are staggering:

• 1.3 billion tonnes of food wasted per year globally
• $1 trillion in economic value destroyed annually
• 28% of agricultural land used to produce food that is never eaten
• 8–10% of global greenhouse gas emissions attributable to food waste
• 820 million people go hungry each day — while we waste enough food to feed 2 billion

Where Does Food Waste Happen?

Food loss and waste occur at every point in the food supply chain — but the patterns differ dramatically between rich and poor countries.

In Low-Income Countries: Loss Happens Early

In developing nations, post-harvest loss is the dominant problem. Food is lost due to:

• Inadequate storage — lack of refrigeration, pest infestation
• Poor transport infrastructure — produce spoils before reaching markets
• Limited processing capacity — surpluses can't be preserved
• Market inefficiencies — price volatility makes it uneconomical to harvest some crops

In Sub-Saharan Africa, post-harvest losses can reach 30–40% of total production for certain crops.

In High-Income Countries: Waste Happens Late

In wealthy nations, loss is concentrated at the retail and consumer end:

• Supermarket overstock — "always full" shelves mean unsold produce is discarded daily
• Cosmetic standards — imperfect produce is rejected and discarded
• Consumer behavior — over-purchasing, confusion about date labels, failure to use leftovers
• Restaurant portion sizes — large portions lead to uneaten food

In the United States, 30–40% of the food supply is wasted — approximately 80 million tonnes per year, worth $408 billion.

The Climate Connection

Why does food waste matter for climate change? When organic waste decomposes in landfills, it produces methane (CH4) — a greenhouse gas approximately 84 times more potent than CO2 over a 20-year timeframe.

Landfills are the third-largest source of human-related methane emissions in the US. But the climate footprint of food waste goes beyond landfill methane — it includes all the emissions generated to produce the wasted food.

What Actually Happens to Organic Waste

The Landfill Problem

In most countries, the majority of organic waste still ends up in landfills. Even in nations with progressive waste policies, organic contamination in landfills remains a major issue.

Composting: The Ideal Circular Solution

Composting — aerobic decomposition of organic matter — converts food scraps and garden waste into nutrient-rich soil amendment. Done well, composting:

• Produces no net methane (aerobic process)
• Creates a valuable soil product that displaces synthetic fertilizers
• Reduces landfill volume
• Can be done at household, community, or industrial scale

San Francisco's Fantastic Three composting program has achieved over 80% landfill diversion — one of the highest rates in North America.

Anaerobic Digestion

Anaerobic digestion (AD) processes organic waste in sealed tanks without oxygen, producing:

• Biogas (primarily methane, captured for energy)
• Digestate (a nutrient-rich slurry used as fertilizer)

AD is particularly well-suited to food waste and agricultural residues. The UK processes approximately 2.5 million tonnes of food waste through AD annually.

Policy Solutions That Work

1. Date Label Reform

Studies consistently show that confusion over "best by," "sell by," and "use by" labels causes billions in unnecessary food waste. The EU has moved to standardize labeling.

2. Food Donation Laws

France's 2016 Loi Gastronomie required supermarkets over 400m2 to donate unsold food to charities, rather than discarding it. Within a year, food donations increased dramatically.

3. Food Waste Reduction Targets

The UN SDG 12.3 calls for halving per capita food waste at retail and consumer levels by 2030.

4. Taxes on Organic Landfill

Several European nations have banned or heavily taxed landfilling of organic waste, forcing investment in composting and AD infrastructure.

What You Can Do

Individual action is meaningful — households account for approximately 50% of food waste in high-income countries:

1. Plan meals before shopping
2. Understand date labels — "best by" is a quality estimate, not a safety date
3. First in, first out — move older items to the front of your fridge/pantry
4. Love your freezer — freeze bread, meat, leftovers before they go bad
5. Compost — even if you can't compost yourself, find a local composting scheme

See Organic Waste in Real Time

Organic waste accounts for roughly 40% of the live counter on our homepage — the largest single category. Watch it tick in real time and see how your country compares.

View the live waste counter | Compare countries

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Sources: FAO "Global Food Losses and Food Waste" (2011, 2019), UNEP Food Waste Index (2021), EPA Food Recovery Hierarchy, WRAP UK