Projected environmental benefits of replacing beef with microbial protein

Area of Science:

• Agricultural Science
• Environmental Science
• Food Science

Background:

• Ruminant meat production significantly impacts the environment through deforestation, greenhouse gas emissions, water use, and eutrophication.
• Alternative protein sources like plant-based meat, cultured meat, and microbial protein (MP) are proposed to mitigate livestock's environmental footprint.
• Life cycle assessment (LCA) studies indicate substantial environmental benefits for MP compared to ruminant meat.

Purpose of the Study:

• To analyze the environmental benefits of microbial protein (MP) as a substitute for ruminant meat within forward-looking global land-use scenarios up to 2050.
• To complement existing LCA studies by evaluating MP's environmental impact within a specific future socio-economic pathway.
• To assess the land-use implications and emission reductions associated with MP adoption.

Main Methods:

• Modeling global land-use scenarios towards 2050.
• Analyzing the impact of substituting ruminant meat with MP on a per-capita protein basis.
• Incorporating socio-economic pathways to estimate environmental benefits.
• Comparing projected outcomes with static LCA methods.

Main Results:

• Substituting 20% of global per-capita ruminant meat consumption with MP by 2050 can offset projected increases in global pasture area.
• This substitution is projected to reduce annual deforestation and associated CO2 emissions by approximately 50%.
• MP adoption also leads to a reduction in methane emissions, with a non-linear saturation effect on emission reductions observed at higher upscaling levels.

Conclusions:

• Microbial protein (MP) shows significant potential to reduce the environmental impact of global food systems, particularly concerning land use and greenhouse gas emissions.
• MP can serve as a viable substitute for ruminant meat, offering substantial environmental benefits that extend beyond static LCA findings.
• Future research should consider dynamic effects and consumer acceptance in assessing the full potential of alternative proteins like MP.