Rapid expansion and demographic increases across the Delhi-National Capital Region (NCR) have led to a decline in greenery, yet a recent scientific study reveals a hidden climate buffer beneath the capital’s soil. Researchers from Jawaharlal Nehru University and the University of Delhi have documented that urban forest ecosystems are absorbing massive quantities of carbon dioxide, with underground soil storage driving over forty percent of total sequestration and holding significant economic potential under emerging carbon credit frameworks.
Unearthing the Subterranean Climate Asset of the Capital
For decades, environmental discussions surrounding India’s bustling capital have focused on the visible crisis: toxic air and rising temperatures. But a detailed ecological assessment of the 1,019-acre Jawaharlal Nehru University campus flips that script. Researchers established five stratified random sampling plots across the university’s forested hectares, measuring trunk diameters, tree height, biomass, and soil profiles down to a depth of thirty centimetres. Here is why that matters: the findings prove that Delhi’s urban forestry is not merely an aesthetic amenity, but a heavy-duty carbon sink.
The numbers challenge conventional wisdom about where forests store their carbon. While towering canopies capture immediate attention, the study reveals that soil organic carbon accounts for more than forty-three percent of the ecosystem’s total sequestration. Specifically, the soil alone traps nearly 149.73 tonnes—or approximately 1,49,730 kilograms—of carbon dioxide equivalent per hectare. Across the broader ecosystem, a single hectare of this urban forest stores nearly 346.9 tonnes of carbon dioxide equivalent.
Native Species and the Botanical Architecture of Sequestration
Not all trees contribute equally to this underground treasury. Among the eleven dominant tree species recorded in the campus study plots, two resilient native varieties emerged as the strongest carbon absorbers: neem (Azadirachta indica) and babool (Acacia nilotica). These particular varieties are indispensable within urban semi-arid environments owing to their impressive capacity for carbon storage and their resilience against severe weather patterns.
Neem trees store 55.10 tonnes, or around 55,100 kilograms, of carbon dioxide equivalent per hectare, while babool trees stored 54.43 tonnes, or around 54,430 kilograms, of carbon dioxide equivalent per hectare. Beyond these mature trees, the study highlights the vital contributions of forest floor litter, shrubs, herbs, and subterranean microbial activity. This holistic biological web demonstrates that maintaining high biodiversity is non-negotiable for maximizing carbon storage. Ecosystems with greater biodiversity and healthier soil stored more carbon overall.
Monetizing Urban Greenery on the Global and Local Ledger
As governments worldwide grapple with net-zero commitments, municipal authorities are increasingly looking for ways to bridge environmental policy and fiscal reality. The Delhi government took a decisive step in January by approving a formal Carbon Credit Monetisation Framework. Through this policy, carbon credits will be calculated scientifically and issued for emission decreases gained via solar energy ventures, waste handling programs, tree-planting campaigns, and electric bus deployments.
Researchers applied current international market valuations to their ecological data, estimating the carbon credit value of JNU’s forest storage at nearly USD 4,846—or more than Rs 4 lakh—per hectare. The soil layer alone accounts for a projected carbon credit worth approximately USD 2,096, which equates to about Rs 1.74 lakh per hectare. Neem and babool individual storage values sit at over USD 771 (over Rs 64,000) and around USD 762 (over Rs 63,000) per hectare, respectively.
| Ecosystem Component | Carbon Storage per Hectare (CO2e) | Estimated Carbon Credit Value (USD / INR) |
|---|---|---|
| Total Forest Ecosystem (JNU Study) | 346.9 tonnes (~3,46,900 kg) | $4,846 / >Rs 4 Lakh |
| Soil Organic Carbon (Top 30cm) | 149.73 tonnes (~1,49,730 kg) | $2,096 / ~Rs 1.74 Lakh |
| Neem (Azadirachta indica) | 55.10 tonnes (~55,100 kg) | $771 / >Rs 64,000 |
| Babool (Acacia nilotica) | 54.43 tonnes (~54,430 kg) | $762 / >Rs 63,000 |
The administrative machinery is already moving to operationalize these metrics. Based on details shared by the Chief Minister’s Office, a specialized agency will be selected by the Environment Department via a tender procedure to pinpoint qualifying carbon credit projects and secure their registration under global criteria. Rekha Gupta had noted that the policy would assist Delhi in bolstering its climate initiatives while simultaneously creating supplementary income for civic projects.
The Broader Geopolitical and Economic Horizon
Ultimately, the subsurface wealth of Delhi’s forests offers a compelling lesson in urban survival. Protecting native species like neem and babool is no longer just a matter of landscape architecture or local air quality management—it is a frontline economic strategy. As the capital prepares to tender its first official carbon registration agencies, the real test will lie in whether bureaucratic execution can match the silent, steady efficiency of the roots beneath the soil.
