Delayed use of bioenergy crops might threaten climate and food security

TY - JOUR

T1 - Delayed use of bioenergy crops might threaten climate and food security

AU - Xu, Siqing

AU - Wang, Rong

AU - Gasser, Thomas

AU - Ciais, Philippe

AU - Penuelas, Josep

AU - Balkanski, Yves

AU - Boucher, Olivier

AU - Janssens, Ivan

AU - Sardans, Jordi

AU - Clark, James Hanley

AU - Cao, Junji

AU - Xing, Xiaofan

AU - Chen, Jianmin

AU - Wang, Lin

AU - Tang, Xu

AU - Zhang, Renhe

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PY - 2022/9/7

Y1 - 2022/9/7

N2 - The potential of mitigation actions to limit global warming within 2 °C might rely on the abundant supply of biomass for large-scale bioenergy with carbon capture and storage (BECCS) that is assumed to scale up markedly in the future. However, the detrimental effects of climate change on crop yields may reduce the capacity of BECCS and threaten food security, thus creating an unrecognized positive feedback loop on global warming. We quantified the strength of this feedback by implementing the responses of crop yields to increases in growing-season temperature, atmospheric CO2 concentration and intensity of nitrogen (N) fertilization in a compact Earth system model. Exceeding a threshold of climate change would cause transformative changes in social–ecological systems by jeopardizing climate stability and threatening food security. If global mitigation alongside large-scale BECCS is delayed to 2060 when global warming exceeds about 2.5 °C, then the yields of agricultural residues for BECCS would be too low to meet the Paris goal of 2 °C by 2200. This risk of failure is amplified by the sustained demand for food, leading to an expansion of cropland or intensification of N fertilization to compensate for climate-induced yield losses. Our findings thereby reinforce the urgency of early mitigation, preferably by 2040, to avoid irreversible climate change and serious food crises unless other negative-emission technologies become available in the near future to compensate for the reduced capacity of BECCS.

AB - The potential of mitigation actions to limit global warming within 2 °C might rely on the abundant supply of biomass for large-scale bioenergy with carbon capture and storage (BECCS) that is assumed to scale up markedly in the future. However, the detrimental effects of climate change on crop yields may reduce the capacity of BECCS and threaten food security, thus creating an unrecognized positive feedback loop on global warming. We quantified the strength of this feedback by implementing the responses of crop yields to increases in growing-season temperature, atmospheric CO2 concentration and intensity of nitrogen (N) fertilization in a compact Earth system model. Exceeding a threshold of climate change would cause transformative changes in social–ecological systems by jeopardizing climate stability and threatening food security. If global mitigation alongside large-scale BECCS is delayed to 2060 when global warming exceeds about 2.5 °C, then the yields of agricultural residues for BECCS would be too low to meet the Paris goal of 2 °C by 2200. This risk of failure is amplified by the sustained demand for food, leading to an expansion of cropland or intensification of N fertilization to compensate for climate-induced yield losses. Our findings thereby reinforce the urgency of early mitigation, preferably by 2040, to avoid irreversible climate change and serious food crises unless other negative-emission technologies become available in the near future to compensate for the reduced capacity of BECCS.

U2 - 10.1038/s41586-022-05055-8

DO - 10.1038/s41586-022-05055-8

M3 - Article

SN - 0028-0836

VL - 609

SP - 299

EP - 306

JO - Nature

JF - Nature

ER -