Difference in GHG emissions (x-axis) and food availability (y-axis) in 2050 for the different scenarios with respect to 'TREND'
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Figure 5. Difference in GHG emissions (x-axis) and food availability (y-axis) in 2050 for the different scenarios with respect to 'TREND'. Panels (A)–(C) and (D) delineate domains where food provision increases ((A), (B)) or decreases ((C), (D)) and GHG emission savings increase ((B), (D)) or decrease ((A), (C)). Colors correspond to the four scenarios, and the symbols at the corners of the triangle to the three productivity pathways. For the 'CONV-L' scenario, the 'Sust-Intens' and 'High-Input' pathways are similar by construction. Solid lines indicate full agriculture and land use emission accounting, and dashed lines agricultural emissions only. Land use change annual emissions are calculated as an average over the simulation period.
In this letter, we investigate the effects of crop yield and livestock feed efficiency scenarios on greenhouse gas (GHG) emissions from agriculture and land use change in developing countries. We analyze mitigation associated with different productivity pathways using the global partial equilibrium model GLOBIOM. Our results confirm that yield increase could mitigate some agriculture-related emissions growth over the next decades. Closing yield gaps by 50% for crops and 25% for livestock by 2050 would decrease agriculture and land use change emissions by 8% overall, and by 12% per calorie produced. However, the outcome is sensitive to the technological path and which factor benefits from productivity gains: sustainable land intensification would increase GHG savings by one-third when compared with a fertilizer intensive pathway. Reaching higher yield through total factor productivity gains would be more efficient on the food supply side but halve emissions savings due to a strong rebound effect on the demand side. Improvement in the crop or livestock sector would have different implications: crop yield increase would bring the largest food provision benefits, whereas livestock productivity gains would allow the greatest reductions in GHG emission. Combining productivity increases in the two sectors appears to be the most efficient way to exploit mitigation and food security co-benefits.