Interventions to increase circularity and reduce environmental impacts in food systems

Area of Science:

• Environmental Science
• Agricultural Science
• Systems Ecology

Background:

• The current food system faces significant environmental challenges, including extensive land use and high greenhouse gas emissions (GHG).
• Circularity interventions offer potential solutions to mitigate these environmental impacts.

Purpose of the Study:

• To assess the environmental benefits of specific circularity interventions in the food system.
• To quantify the impact of changes in diets, trade, and waste utilization on land use and GHG emissions.

Main Methods:

• Utilized an iterative linear food system optimization model (FOODSOM).
• Simulated scenarios incorporating circular diets, balanced nutrient imports/exports, and waste stream utilization.
• Compared environmental outcomes against a baseline of the current food system.

Main Results:

• Circularity interventions reduced land use by an average of 40% and GHG emissions by 68%.
• A shift to a circular diet alone decreased land use by 43% and GHG emissions by 52%.
• Allowing balanced nutrient imports/exports reduced land use by up to 34% and GHG emissions by up to 26%.

Conclusions:

• Circularity interventions are most effective when implemented in combination, not isolation.
• The optimal strategy for minimizing land use and GHG emissions involves a circular diet, utilization of waste streams, and balanced food imports/exports.
• Food system circularity presents a viable pathway to significant environmental improvements.