Archives of Current Research International

The circular bioeconomy reframes agricultural residues and organic by-products as strategic resources for climate mitigation, soil restoration, and input substitution. This critical review examines three high-leverage pillars—residue recycling, biochar systems, and climate-oriented management of organic amendments—through agronomic, environmental, and implementation lenses. We first synthesize how shifting residues from open burning and unmanaged decay toward aerobic composting, anaerobic digestion with contained storage, and in-field retention can reduce methane, nitrous oxide, and particulate emissions while returning stabilized carbon and nutrients to soils. We then evaluate biochar as a durable carbon sink that also modulates soil processes affecting non-CO₂ gases, water retention, and nutrient efficiency; attention is given to feedstock logistics, pyrolysis conditions, and the co-benefits and trade-offs of energy co-products. Finally, we assess composts, manures, and digestates as climate tools, emphasizing timing, placement, and carbon-to-nitrogen management that align yield goals with lower emission intensity. Across pathways, credible climate accounting depends on life-cycle system boundaries that include avoided emissions, process energy, transport, and product displacement, alongside robust treatment of additionality, leakage, and permanence. We review emerging measurement, reporting, and verification approaches suitable for farms, cooperatives, and regional programs, and propose practical indicators to support transparent carbon claims. Implementation requires enabling infrastructure and policy: modular processing, quality standards, incentives that reward verified outcomes, and advisory services that translate carbon metrics into agronomic decisions. Equity considerations are central; smallholders need access to equipment, finance, and simplified MRV, with benefits visible as improved soil function and yield stability.

The review identifies five priorities to accelerate progress: context-specific response functions that predict when and where each pathway performs best; integrated management of residues and water in flooded systems; digestate processing and delivery methods that minimize gaseous losses; harmonized durability and uncertainty treatment for biochar; and longitudinal socio-economic evidence on adoption, labor, and air-quality gains where burning is displaced. Overall, circular bioeconomy strategies can deliver meaningful, verifiable mitigation while enhancing soil health and resilience. Realizing this potential hinges on integrating agronomy with rigorous accounting and on aligning finance and policy with the practical realities of farms and supply chains.