- Individual Impact
- Combined Impact
Roughly one-third of the edible parts of food produced for human consumption, gets lost or wasted globally, which is about 1.3 billion ton per year
FAO, Global Food Losses and Food Waste. Extent, Causes and Prevention
If everyone on the planet adopted healthy consumption practices and a plant-rich (not necessarily vegetarian) diet, 166 million metric tons of food waste could be avoided over the next 30 years.
Massively Reducing Food Waste Could Feed the World, Scientific American
15 quick tips for reducing food waste and becoming a Food hero
Food and Agriculture Organisation of the United Nations
If food wastage were a country, it would be the third largest emitting country in the world.
FAO Food wastage footprint & Climate change
Impact metric calculations
To determine the carbon emission reduction estimates related to upstream food reduction (through buying less, loving leftovers, etc.) and composting, the following calculations were performed:
Upstream food reduction efforts:
(# of people in household) x (kg food waste/person) x (percentage of food waste reduced) x (1.7 kg CO2e/kg food) = kg CO2e / household / month
(# of people in household) x (kg food waste/person) x (average percentage of food waste likely diverted to landfill x (percentage of food waste not reduced) x [(0.56 kg CO2e/kg landfilled food waste) - (0.16 kg CO2e/kg composted food waste) = kg CO2e / household / month
For detailed calculations, references and assumptions, please see our Methodology page