Exploring the biophysical option space for feeding the world without deforestation

Area of Science:

• Agricultural Science
• Environmental Science
• Food Security

Background:

• Protecting global forests is critical for environmental sustainability.
• Future food demand necessitates innovative solutions to prevent deforestation.
• Balancing agricultural needs with conservation is a key challenge.

Purpose of the Study:

• To evaluate the feasibility of meeting global food demand by 2050 without further deforestation.
• To explore the range of biophysical options available under a zero-deforestation scenario.
• To analyze the impact of different agricultural and dietary strategies on land use and food supply.

Main Methods:

• Systematic combination of realistic assumptions on future crop yields, agricultural land expansion, livestock feed requirements, and human dietary patterns.
• Scenario modeling to assess crop product supply versus demand.
• Evaluation of grazing intensity within plausible ecological limits for each scenario.

Main Results:

• Multiple viable pathways exist to achieve global food supply by 2050 without deforestation, even with conservative crop yield projections.
• Significant variations in biomass harvest, cropland demand, and grazing intensity across scenarios, primarily driven by dietary choices (quantity and type).
• Grazing constraints significantly narrow the range of feasible solutions, highlighting the importance of sustainable livestock management.

Conclusions:

• Achieving zero-deforestation food supply is possible, but requires careful consideration of dietary shifts and land-use management.
• Without access to natural or semi-natural lands, increased global trade is necessary, potentially reducing food self-sufficiency in developing regions.
• Dietary composition plays a crucial role in determining the overall land footprint and feasibility of sustainable food systems.