Biochar Revolution: How tech and farmers are decarbonizing India’s cotton fields

In a major move to decarbonize the global fashion supply chain, Microsoft has signed a massive offtake agreement with climate-tech firm Varaha to purchase over 100,000 metric tons of carbon-removal credits. The deal, finalized in early 2026, centers on the conversion of agricultural waste into high-stability biochar, a process that promises to turn the soot-choked cotton fields of India into a high-yield, carbon-negative engine for the retail sector.

Industrial-scale decarbonization meets apparel supply chain

The agreement finances the deployment of 18 industrial biomass gasification reactors across India’s primary cotton-growing regions, including Maharashtra, Gujarat, and Rajasthan. By diverting cotton stalks traditionally burned by farmers, causing severe seasonal air pollution into these reactors, Varaha converts the biomass into biochar. This mineral-enhanced material locks carbon into a crystalline matrix for decades. For the apparel industry, which is under intense regulatory pressure to account for Scope 3 emissions, this project provides a traceable, data-backed mechanism to offset the environmental footprint of raw fiber production at the source.

Table: Textile industry carbon targets and biochar impact

Digital infrastructure as a yield multiplier for smallholders

The collaboration leverages Microsoft’s Azure Data Manager for Agriculture and AI-driven monitoring tools to verify the impact on the ground. Beyond carbon sequestration, the project creates a circular economic model for approximately 45,000 smallholder farmers. These farmers are paid to supply their crop residues and, in return, receive the processed biochar to use as a soil amendment. Early data from regional pilots in Maharashtra indicates that biochar application can boost cotton yields significantly, bridging the gap between Indian averages and global benchmarks.

The Maharashtra high-yield pilot (2024-25)

A field trial conducted in Ambajogai, Maharashtra, demonstrated the transformative potential of biochar on cotton productivity.

• Control Plot (Organic/Standard): 72 kg/acre
• Biochar-Treated Plot: 404 kg/acre
• Conventional (Chemical) Plot: 200 kg/acre

The findings were that biochar application not only quintupled organic yields but also outperformed conventional chemical-intensive methods by 102 per cent, offering a viable path for ‘Green’ cotton without synthetic inputs.

Institutional capital flows into regenerative fiber markets

The financial viability of such large-scale technology shifts is being de-risked by a rise in institutional interest. Along with the Microsoft deal, Varaha recently secured $30 million from Mirova and an additional $20 million Series B led by WestBridge Capital. This capital influx signals a shift in the retail scenario: climate-smart cotton is no longer a niche premium product but a scalable industrial asset. As the global organic cotton market is projected to reach $50.78 billion by 2034, the ability to generate high-integrity credits from the Global South is becoming a competitive advantage for tech giants and fashion conglomerates alike.

Table: Regenerative and sustainable cotton market forecast

Scaling the green cotton blueprint globally

While the immediate focus is on India’s regenerative farmland, the broader impact extends to the global retail market. By integrating satellite-driven Measurement, Reporting, and Verification (MRV) systems, Varaha and Microsoft are creating a blueprint for transparent, sustainable sourcing. This technological layer allows brands to move beyond vague sustainability claims to connected intelligence, where every bale of cotton can be linked to specific carbon-removal metrics. The challenge remains the fragmentation of landholdings, but with 18 reactors set to operate for 15 years, the project is poised to remove over 2 million tons of CO2, fundamentally retooling the economics of the Indian cotton belt.

Varaha is a premier climate-tech developer specializing in nature-based carbon removal across India and Southeast Asia. Operating in key markets like Nepal and Bangladesh, it utilizes AI and remote sensing to scale regenerative agriculture and biochar production. Following a landmark $30 million Mirova investment, Varaha is expanding its reach to 337,000 farms, leveraging a high-growth trajectory to lead the Global South's $1.6T carbon credit opportunity.