具有碳捕获和储存功能的生物能源
粮食安全
环境科学
气候变化
减缓气候变化
生物能源
生物量(生态学)
全球变暖
自然资源经济学
农学
环境保护
农业
生态学
生物燃料
经济
生物
作者
Siqing Xu,Rong Wang,Thomas Gasser,Philippe Ciais,Josep Peñuelas,Yves Balkanski,Oliviér Boucher,Ivan A. Janssens,Jordi Sardans,James H. Clark,Junji Cao,Xiaofan Xing,Jianmin Chen,Lin Wang,Xu Tang,Renhe Zhang
出处
期刊:Nature
[Nature Portfolio]
日期:2022-09-07
卷期号:609 (7926): 299-306
被引量:88
标识
DOI:10.1038/s41586-022-05055-8
摘要
The potential of mitigation actions to limit global warming within 2 °C (ref. 1) 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 future2-5. However, the detrimental effects of climate change on crop yields may reduce the capacity of BECCS and threaten food security6-8, 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 model9. 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.
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