Ruminant meat provides valuable protein to humans, but livestock production has many negative environmental impacts, especially in terms of deforestation, greenhouse gas emissions, water use and eutrophication1. In addition to a dietary shift towards plant-based diets2, imitation products, including plant-based meat, cultured meat and fermentation-derived microbial protein (MP), have been proposed as means to reduce the externalities of livestock production3,4,5,6,7. Life cycle assessment (LCA) studies have estimated substantial environmental benefits of MP, produced in bioreactors using sugar as feedstock, especially compared to ruminant meat3,7. Here we present an analysis of MP as substitute for ruminant meat in forward-looking global land-use scenarios towards 2050. Our study complements LCA studies by estimating the environmental benefits of MP within a future socio-economic pathway. Our model projections show that substituting 20% of per-capita ruminant meat consumption with MP globally by 2050 (on a protein basis) offsets future increases in global pasture area, cutting annual deforestation and related CO2 emissions roughly in half, while also lowering methane emissions. However, further upscaling of MP, under the assumption of given consumer acceptance, results in a non-linear saturation effect on reduced deforestation and related CO2 emissions—an effect that cannot be captured with the method of static LCA.
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This work received funding from the European Union’s Horizon 2020 research and innovation program under grant nos. 821124 (NAVIGATE) and 821471 (ENGAGE). Further support was provided by the Global Commons Stewardship project funded by the University of Tokyo (grant no. 94104), the GreenPlantFood project funded by the Research Council of Norway (grant no. 319049) and the Food System Economics Commission funded by the Wellcome Trust (grant no. 221362/Z/20/Z) and the Rockefeller (2020 FOD 008) and IKEA Foundations (G-2009-01682).
The authors declare no competing interests.
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Extended data figures and tables
All scenarios quantified with the MAgPIE model in this study are based on the Shared Socio-economic Pathway 2 (SSP2). a) shows regional projections of population for SSP2 based on KC and Lutz55. b) shows regional projections of income for SSP2 based on Dellink et al56. Historical data for comparison from World Bank World Development Indicators (WDI)57 and James et al58. The historical data has been processed using the pik-piam/mrvalidation R package59.
Extended Data Fig. 2 Future scenarios of microbial protein as substitute for ruminant meat in human diets.
Data is shown at regional level for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). a) shows per-capita consumption of ruminant meat. b) shows per-capita consumption of microbial protein. Units are in kcal/capita/day (left axis) and g protein/capita/day (right axis). Historical data for comparison from Bodirsky et al60. The historical data has been processed using the pik-piam/mrvalidation R package59.
Data is shown at regional level for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). a) shows total demand for ruminant meat. b) shows total demand for microbial protein. Total demand accounts for population and per-capita consumption. Historical data for comparison from FAO8. The historical data has been processed using the pik-piam/mrvalidation R package59.
Data is shown at global level for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). a) shows feed demand for ruminant meat production from cropland and pasture. b) shows feedstock demand for microbial protein production from cropland. c) shows corresponding system-wide land-use change for cropland and pasture.
Data is shown at regional level for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). Land-use change for cropland, pasture, forest and other natural land is indicated by color.
Data is shown for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). a) shows deforestation at regional level. b) shows agricultural water use at global level (no regional historical data available). Historical data for comparison from FAO8, Foley et al61, Wada et al62 and Wisser et al63. The historical data has been processed using the pik-piam/mrvalidation R package59.
Data is shown at regional level for four MAgPIE scenarios (MP0, MP20, MP50 and MP80). a) shows CO2 emissions from land-use change. b) shows N2O emissions from agriculture. c) shows CH4 emissions from agriculture. d) shows nitrogen fixation. For the conversion of N2O and CH4 emissions into CO2 equivalents (right axis) we used GWP100 factors of 265 and 28, respectively. Historical data for comparison from Gasser et al64, the EDGAR emissions database version 4.265 and Bodirsky et al51. The historical data has been processed using the pik-piam/mrvalidation R package59.
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Humpenöder, F., Bodirsky, B.L., Weindl, I. et al. Projected environmental benefits of replacing beef with microbial protein. Nature 605, 90–96 (2022). https://doi.org/10.1038/s41586-022-04629-w