Biochar has been lauded for its potential to mitigate climate change, increase crop yields and reverse land degradation in tropical agricultural systems. Despite its benefits, confusion persists about whether the use of biochar is financially feasible as a soil ameliorant. A comprehensive review of previous studies of biochar's financial feasibility was performed (33 relevant publications). Financial performance appraisal (US$ Mg‐1 biochar) and greenhouse gas abatement cost estimates (US$ Mg‐1 CO2e) were used to gauge the financial feasibility of the biochar scenarios within each publication. Ordinary Least Squares Multiple Linear Regression was used to evaluate the predictive capacity of scenario financial feasibility as dependent on variables including national income levels, climatic conditions, pyrolysis technology scales and pyrolysis capabilities. Analysis revealed that scenarios where biochar was applied targeting yield increases in high‐value crops in tropical locations with low incomes and biochar‐focused small‐scale production, were overall significant predictors of biochar scenario financial feasibility. We find that the average abatement cost of biochar applied in ‘lower‐income countries' is ‐US$58 Mg‐1 CO2e (financially feasible) compared with +US$93 Mg‐1 CO2e in ‘higher‐income countries' (not financially feasible). Climate policies of lower‐income countries in tropical climates should consider biochar as an input for small‐scale climate smart agriculture to address land degradation in tropical agricultural systems. Based on recent evidence it is suggested that biochar fertilizers, a value‐added biochar product, could present a commercially feasible pathway for biochar value‐chain development in higher‐income countries.

中文翻译：

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在低收入国家热带土壤的小规模农业中克服了生物炭的成本限制

生物炭因其在热带农业系统中减缓气候变化、增加作物产量和扭转土地退化的潜力而受到称赞。尽管有好处，但关于使用生物炭作为土壤改良剂在经济上是否可行的问题仍然存在。对以前的 biochar 财务可行性研究进行了全面审查（33 篇相关出版物）。财务绩效评估（US$ Mg-1 biochar）和温室气体减排成本估算（US$ Mg-1 CO2e）用于衡量每个出版物中生物炭情景的财务可行性。普通最小二乘多元线性回归用于评估情景财务可行性的预测能力，因为它依赖于包括国民收入水平、气候条件、热解技术规模和热解能力。分析表明，在低收入和以生物炭为重点的小规模生产的热带地区，应用生物炭以提高高价值作物的产量的情景是生物炭情景财务可行性的总体重要预测因素。我们发现，“低收入国家”应用生物炭的平均减排成本为 ‐58 美元 Mg‐1 CO2e（财务上可行），而“高收入国家”则为 + 93 Mg‐1 CO2e（财务上不可行） . 热带气候下低收入国家的气候政策应考虑将生物炭作为小规模气候智能农业的投入，以解决热带农业系统中的土地退化问题。根据最近的证据表明，生物炭肥料是一种具有附加值的生物炭产品，