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Enhanced Rock Weathering in India’s Climate Race

India’s farms could quietly become carbon sinks, turning basalt dust into a climate solution while boosting soil health and productivity.

India ERW

India rarely gets framed as a carbon removal powerhouse, yet beneath its soil lies one of the most overlooked opportunities in climate science. Enhanced Rock Weathering (ERW) is not a futuristic idea here: it is geographically inevitable. The vast spread of the Deccan Traps, one of the world’s largest basalt provinces, gives India something most countries lack: proximity to reactive rock at scale.

When finely crushed basalt is applied to cropland, it reacts with atmospheric CO₂ and rainwater, locking carbon into stable bicarbonates. In tropical climates like India’s, this reaction accelerates significantly. Studies suggest ERW could remove 0.5 to 2 tons of CO₂ per hectare annually, with higher rates in high-rainfall zones (Beerling et al., 2020, Nature). If even a fraction of India’s ~160 million hectares of agricultural land adopts ERW, the removal potential could reach hundreds of millions of tons per year.
 
But the real story in India is not just carbon, it’s soil. Many Indian soils suffer from nutrient depletion and acidity imbalance. Basalt dust naturally releases calcium, magnesium, and micronutrients, acting as a slow-release fertilizer. Field trials globally have reported yield increases of up to 15–20%, a figure that could be transformative for Indian farmers balancing productivity and cost.

Enhanced Rock Weathering

The real bottleneck is not geology or chemistry — it is measurement.
Monitoring, Reporting, and Verification
remains the key challenge.

 ·  Key Challenges in India  · 

The economics are unusually favorable. Unlike many carbon removal technologies, ERW in India benefits from short transport distances between basalt sources and farms. This reduces both cost and emissions. Estimates place ERW costs globally between $80–200 per ton of CO₂, but India could realistically operate at the lower end of this range due to resource proximity and labor availability (IPCC, 2022).

The real bottleneck is not geology or chemistry, it is measurement. Monitoring, Reporting, and Verification (MRV) remains the key challenge. Quantifying how much CO₂ is actually removed across millions of farms requires a fusion of soil sampling, geochemical modeling, and satellite-based monitoring. This is where data-driven approaches, like those being developed by companies such as Eartures, become critical.

India does not need to import a carbon removal solution. It already has one embedded in its land, its geology, and its agricultural system. The question is no longer whether ERW can work here. It is whether India will recognize its potential in time to scale it.

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