Bioenergy with carbon capture and storage (BECCS) can act as a negative emission technology and is considered crucial in many climate change mitigation pathways that limit global warming to 1.5–2 °C; however, the negative emission potential of BECCS has not been rigorously assessed. Here we perform a global spatially explicit analysis of life-cycle GHG emissions for lignocellulosic crop-based BECCS. We show that negative emissions greatly depend on biomass cultivation location, treatment of original vegetation, the final energy carrier produced and the evaluation period considered. We find a global potential of 28 EJ per year for electricity with negative emissions, sequestering 2.5 GtCO₂ per year when accounting emissions over 30 years, which increases to 220 EJ per year and 40 GtCO₂ per year over 80 years. We show that BECCS sequestration projected in IPCC SR1.5 °C pathways can be approached biophysically; however, considering its potentially very large land requirements, we suggest substantially limited and earlier deployment.

带有碳捕集与封存的生物能源（BECCS）可以作为一种负排放技术，被认为在许多缓解气候变化的途径中至关重要，这些途径将全球变暖限制在1.5–2°C；但是，BECCS的负排放潜力尚未得到严格评估。在这里，我们对基于木质纤维素作物的BECCS进行生命周期温室气体排放的全球空间显式分析。我们表明负排放在很大程度上取决于生物量的种植位置，原始植被的处理，产生的最终能量载体以及所考虑的评估期。我们发现负排放电力的全球潜力为每年28 EJ，当计算30年的排放量时，每年封存2.5 GtCO ₂，这增加到每年220 EJ和40 GtCO ₂每年超过80年。我们表明，IPCC SR1.5°C途径中预测的BECCS隔离可以通过生物物理方法进行；但是，考虑到其潜在的非常大的土地需求，我们建议进行有限且较早的部署。