A review by Amreen Bano and colleagues in Environmental Chemistry and Ecotoxicology highlights biochar’s transformative potential in mitigating climate change and improving soil health. Produced via pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More in oxygen-limited conditions, biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More retains up to 50% of the carbon from organic matter. This enables biochar to sequester approximately 62-66% of carbon dioxide emissions, reducing greenhouse gases while enhancing soil fertility.

Biochar’s versatility is emphasized through its role in improving water retention, nutrient availability, and microbial activity in soil. Its porous structure and functional groups make it an effective adsorbent, aiding in the remediation of pollutants from water and soil. Additionally, it holds promise in sustainable agriculture by increasing crop yields and reducing the reliance on chemical fertilizers.

The study also underscores biochar’s importance in a circular economy, where waste materials, such as agricultural residues, are transformed into valuable resources. However, challenges remain, including optimizing production methods and addressing contaminants like heavy metals or polycyclic aromatic hydrocarbons in biochar derived from certain feedstocks.

To maximize its benefits, future research must focus on refining application techniques and understanding long-term impacts on soil and ecosystems. Biochar emerges as a low-cost, sustainable tool for reducing carbon emissions, enhancing agricultural productivity, and contributing to a greener future.

This synthesis positions biochar as a cornerstone in tackling 21st-century challenges of climate change, waste management, and food security.

SOURCE: Bano, et al (2025) The multifaceted power of biochar: A review on its role in pollution control, sustainable agriculture, and circular economy. Environmental Chemistry and Ecotoxicology. https://doi.org/10.1016/j.enceco.2025.01.004