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Reducing food loss and waste is key to meeting rising food demand and cutting agricultural greenhouse gas (GHG) emissions. This study quantifies consumer food waste globally, highlighting its significant environmental impact.

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Food Systems Analysis

Background:

  • Increasing global food demand and limited options for production intensification necessitate sustainable solutions.
  • Food availability in 2010 exceeded global requirements by 20%, indicating substantial potential for waste reduction.
  • Addressing food loss and waste can mitigate agricultural greenhouse gas (GHG) emissions.

Purpose of the Study:

  • To develop a systematic approach for estimating consumer-level food waste globally and by country.
  • To analyze the trends in global food requirements, surplus, and associated GHG emissions over the past 50 years.
  • To project future food surplus and GHG emissions based on demographic and consumption patterns.

Main Methods:

  • Estimating country-scale and global food waste based on the difference between food availability and requirements.
  • Calculating food requirements considering demographic changes, average body weights, and physical activity levels.
  • Quantifying greenhouse gas emissions linked to estimated food surplus.

Main Results:

  • Global food surplus increased from 310 to 510 kcal/cap/day over the last 50 years, with associated GHG emissions rising over 300% (130 Mt CO2eq/yr to 530 Mt CO2eq/yr).
  • Despite a modest increase in global food requirements (2,300 to 2,400 kcal/cap/day), food surplus has grown significantly.
  • Future projections indicate a potential surge in global food surplus to 850 kcal/cap/day by 2050, escalating GHG emissions to 1.9-2.5 Gt CO2eq/yr.

Conclusions:

  • Consumer food waste represents a substantial and growing environmental burden, primarily through increased GHG emissions.
  • Sustainable food production and consumption adjustments are critical to counteract rising food demand and environmental impact.
  • Urgent interventions are needed to curb food waste and mitigate its projected dramatic increase in GHG emissions.