生物能源结合碳捕集封存（BECCS）在碳核算上有哪些争议？
What accounting controversies surround bioenergy with carbon capture and storage (BECCS)?
BECCS 被视为负排放，但其净减排取决于土地利用变化、肥料与运输排放是否被计入。若以毁林或高投入换取生物质，其负排放可能被高估甚至反转。
BECCS is treated as negative emissions, yet net benefit depends on whether land-use change, fertilizer, and transport emissions are counted. Forest clearance or input-heavy biomass can overstate or reverse the negative balance.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
IPCC AR6 第一工作组报告,Cambridge University Press,2021
IPCC AR6 WG1, Climate Change 2021: The Physical Science Basis, CUP, 2021
#BECCS #负排放 #碳核算
评估碳移除项目持久性时应关注哪些时间尺度和可逆性风险？
What timescales and reversibility risks matter when assessing carbon removal permanence?
持久性按封存介质从百年到万年级不等：矿化最稳，森林与土壤易受火灾、病害逆转。核算需设定监测期、缓冲账户与逆转扣减规则。
Permanence ranges from centuries to tens of millennia by medium: mineralization is most stable, while forests and soils are reversible via fire or disease. Accounting needs monitoring periods, buffer accounts, and reversal deductions.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
IPCC AR6 第一工作组报告,Cambridge University Press,2021
IPCC AR6 WG1, Climate Change 2021: The Physical Science Basis, CUP, 2021
#碳移除 #持久性 #可逆性
直接空气捕集的能耗与经济性瓶颈在哪里？
Where are the energy and economic bottlenecks of direct air capture?
因空气中 CO2 浓度仅约 420 ppm，捕集需大量风流与高品位热能再生吸附剂，单位能耗远大于点源捕集。当前成本远高于多数减排手段，依赖廉价零碳热与电才能规模化。
At about 420 ppm, DAC needs huge airflow and high-grade heat to regenerate sorbents, giving far higher energy per ton than point-source capture. Current costs far exceed most mitigation, requiring cheap zero-carbon heat and power to scale.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《Nature Sustainability》DAC 综述
Nature Sustainability DAC review
#DAC #能耗 #成本
直接空气捕集（DAC）技术的基本原理是什么？
What is the basic principle of direct air capture (DAC)?
DAC 利用风扇将空气通过化学吸附剂，选择性捕获低浓度的二氧化碳，再经加热或降压释放高纯 CO2 用于封存或利用。其优势是不受区位限制，但能耗较高。
DAC uses fans to pass air over chemical sorbents that selectively capture dilute CO2, then releases pure CO2 via heating or pressure swing for storage or use. It is location-flexible but energy-intensive.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
IPCC AR6 第一工作组报告,Cambridge University Press,2021
IPCC AR6 WG1, Climate Change 2021: The Physical Science Basis, CUP, 2021
#直接空气捕集 #DAC #碳捕集
碳捕集与封存（CCS）中的二氧化碳通常封存于何处？
Where is captured CO2 typically stored in carbon capture and storage (CCS)?
捕集的 CO2 经压缩后注入深部咸水层、枯竭油气藏等地质构造中，以超临界态长期封存。选址需评估盖层密封性与泄漏风险。
Captured CO2 is compressed and injected into deep saline aquifers or depleted oil and gas fields, stored as a supercritical fluid long term. Site selection must assess caprock sealing and leakage risk.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
IPCC AR6 第一工作组报告,Cambridge University Press,2021
IPCC AR6 WG1, Climate Change 2021: The Physical Science Basis, CUP, 2021
#CCS #地质封存 #咸水层
增强风化如何实现二氧化碳移除？
How does enhanced weathering remove carbon dioxide?
将粉碎的硅酸盐岩（如玄武岩）撒布于土壤或海岸，加速其与 CO2 反应生成碳酸盐并长期稳定。它是低成本、可规模化的矿化固碳路径之一。
Spreading crushed silicate rock such as basalt on land or coasts speeds reactions with CO2 to form stable carbonates. It is a low-cost, scalable mineralization pathway.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《Nature Sustainability》增强风化研究
Nature Sustainability enhanced weathering
#增强风化 #矿化固碳 #硅酸盐
海洋碱化作为一种碳移除路径的原理与风险是什么？
What is the principle and what are the risks of ocean alkalinity enhancement as carbon removal?
向海洋添加碱性物质（如橄榄石粉）提升碱度，促使更多 CO2 转化为碳酸氢根长期储存。风险在于局部 pH 扰动可能影响浮游生物与碳循环，需严格监测。
Adding alkaline material such as olivine raises ocean alkalinity, converting more CO2 into bicarbonate for long-term storage. Risks include local pH disturbance affecting plankton and carbon cycling, requiring strict monitoring.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《Science》海洋地球工程研究
Science marine geoengineering
#海洋碱化 #碳移除 #海洋地球工程