気候変動対策のためのCO2地下貯留に限界があることが研究で判明(Study finds limits to storing CO2 underground to combat climate change)

2024-08-28 インペリアル・カレッジ・ロンドン(ICL)

＜関連情報＞

• https://www.imperial.ac.uk/news/255614/study-finds-limits-storing-co2-underground/
• https://www.nature.com/articles/s41467-024-51226-8

今世紀半ばまでにギガトン規模のCO2貯留に到達する可能性 The feasibility of reaching gigatonne scale CO2 storage by mid-century

Yuting Zhang,Christopher Jackson & Samuel Krevor
Nature Communications  Published:28 August 2024
DOI:https://doi.org/10.1038/s41467-024-51226-8

Abstract

The Sixth Assessment Report by the Intergovernmental Panel on Climate Change projects subsurface carbon storage at rates of 1 – 30 GtCO₂ yr⁻¹ by 2050. These projections, however, overlook potential geological, geographical, and techno-economic limitations to growth. We evaluate the feasibility of scaling up CO₂ storage using a geographically resolved growth model that considers constraints from both geology and scale-up rate. Our results suggest a maximum global storage rate of 16 GtCO₂ yr⁻¹ by 2050, but this is contingent on the United States contributing 60% of the total. These values contrast with projections in the Sixth Assessment Report that vastly overestimate the feasibility of deployment in China, Indonesia, and South Korea. A feasible benchmark for global CO₂ storage projections, and consistent with current government technology roadmaps, suggests a global storage rate of 5-6 GtCO₂ yr⁻¹, with the United States contributing around 1 GtCO₂ yr⁻¹.