Key Terms & Concepts — UPSC Mains
Biochar
"A stable, carbon-rich charcoal made by heating biomass without oxygen, used to enrich soil and lock away carbon for centuries"
Biochar is a fine-grained, porous, carbon-rich material produced by pyrolysis, the heating of organic biomass (crop residue, wood, manure) at high temperature in the absence or near-absence of oxygen. When added to soil it improves water retention, nutrient availability and microbial health, while the carbon it contains resists decomposition for hundreds of years, making it a long-term carbon sink. Biochar therefore doubles as a soil amendment and a carbon dioxide removal (CDR) technique recognised under climate frameworks.
Relevant for GS3 (climate mitigation, soil health, sustainable agriculture, waste-to-wealth). Biochar offers a low-tech route to negative emissions and a productive use for agricultural residue, reducing stubble burning that fuels North India's winter air pollution. It links to India's natural farming, circular economy and carbon-credit agendas and features in voluntary carbon markets in 2026.
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- 2 Improves soil water-holding capacity, cation exchange and microbial activity, raising crop yields on degraded soils
- 3 Stores carbon in a stable form for hundreds of years, qualifying as carbon dioxide removal
- 4 Offers a productive alternative to crop-residue burning, easing seasonal air pollution in the Indo-Gangetic plain
- 5 Recognised by the IPCC as a negative-emissions technology and traded in voluntary carbon markets
- 6 Co-products of pyrolysis include bio-oil and syngas that can be used for energy
- 7 Aligns with circular economy, waste-to-wealth and natural farming goals
In 2026 biochar projects that convert paddy stubble into a soil amendment gained traction in Punjab and Haryana as a way to curb crop-residue burning while generating saleable carbon-removal credits.
