Urban Green Carbon
Infrastructure
THS v1.0 - Annex J
Urban Green Carbon Infrastructure integrates trees, green roofs, vertical gardens, and other vegetated surfaces directly into the built urban environment - street tree pits, green facades, park systems, and green roof installations - monitored through connected sensor networks that track both carbon performance and urban co-benefits like heat island mitigation and stormwater management. Unlike open-land forestry, this pathway operates within the physical and regulatory constraints of dense urban infrastructure, requiring engineered growing systems designed for the built environment.
How this pathway works
Urban trees, green roofs, and vertical gardens sequester carbon just as their rural counterparts do, but face a fundamentally different growing environment - engineered soil cells and structural support systems to survive under pavement and building loads, irrigation systems to compensate for impervious surface runoff, and often more constrained root volume than open-land plantings. This pathway credits carbon sequestration from vegetation deliberately integrated into the built urban environment, monitored through connected sensor networks tracking tree health, growth, and the urban co-benefits - heat island mitigation, stormwater retention - that make this pathway valuable to cities beyond its direct carbon benefit.
Under the Teravent Hybrid Carbon Standard (THS v1.0) Annex J, this pathway is classified as hybrid because urban vegetation survival and growth depend directly on the engineered growing infrastructure supporting it - structural soil cells, irrigation systems, and root barriers are not incidental but essential to the biological system functioning at all within the built environment. Teravent Hybrid Credits (THC) are issued for verified net tonnes of CO₂ sequestered in urban vegetation biomass, net of full lifecycle project emissions.
THS v1.0 - Annex J
This pathway is governed exclusively by the Teravent Hybrid Carbon Standard (THS v1.0). No external registry, standard, or methodology is referenced or incorporated.
Three approved methodology variants
THS v1.0 Annex J approves three methodology types, differentiated by the urban green infrastructure format.
Street trees planted in dense urban corridors typically require structural soil cells - engineered systems providing adequate root volume and drainage beneath pavement without compromising load-bearing capacity - along with root barriers to prevent infrastructure damage. Connected sensors monitor soil moisture, tree health indicators, and growth, feeding both carbon verification and municipal tree maintenance planning.
- Tree biomass growth tracked via periodic allometric measurement and connected sensor health indicators
- Survival and mortality rate tracked against the documented urban tree baseline mortality rate
- Soil cell and irrigation infrastructure operational status confirmed at each verification
- Urban heat and air quality co-benefit indicators tracked where instrumentation is available
Green roofs and vertical garden (living wall) systems integrate vegetation directly into building envelopes, using lightweight engineered growing media designed to meet structural load limits while supporting plant growth, with drip irrigation and drainage layers managing water. Sensor networks monitor substrate moisture and plant health, supporting both carbon verification and the buildings' own energy performance monitoring given green roofs' insulation co-benefit.
- Vegetation cover and biomass surveyed periodically, supported by substrate moisture and plant health sensors
- Structural load compliance documentation confirmed at installation
- Irrigation and drainage system operational status confirmed at each verification
- Building energy performance or stormwater retention co-benefit tracked where instrumentation is available
Larger urban parks and green spaces, whether newly created or intensively re-designed, integrate tree canopy, understory vegetation, and often engineered stormwater management features (bioswales, retention ponds) within a coordinated green infrastructure system. This methodology credits the aggregate carbon sequestration of the vegetated system, verified through a combination of periodic allometric surveys and, at larger scale, satellite or drone-based canopy monitoring.
- Tree and understory vegetation biomass tracked via periodic allometric surveys at representative plots
- Satellite or drone-based canopy cover monitoring for larger park systems
- Stormwater feature performance tracked as a co-benefit indicator where applicable
- Community consultation documentation for publicly accessible sites
Which emission sources must be counted
Measurement, reporting
& verification
Urban vegetation biomass is tracked via periodic allometric measurement at the individual tree or plot level, supplemented for larger sites (UGR-M03) by satellite or drone-based canopy monitoring. Connected sensor networks (soil moisture, substrate conditions, tree health indicators) provide continuous supporting data confirming growing infrastructure is functioning as designed, feeding into both carbon MRV and standard municipal green infrastructure maintenance systems.
Demonstrating additionality
Leakage types & deductions
Buffer pool & NPRR assessment
| Methodology | NPRR Rating | Buffer Pool Rate | Primary Reversal Risks |
|---|---|---|---|
| UGR-M01 Street Trees | Medium–High | 20–35% | Utility conflicts; vehicle/construction damage; urban tree mortality |
| UGR-M02 Green Roofs/Walls | Medium–High | 20–38% | Building renovation or roof replacement; irrigation system failure |
| UGR-M03 Urban Parks | Medium | 20–35% | Redevelopment pressure; drought; maintenance discontinuation |
Key registration criteria
Sustainable Development
Goal alignment
Deployment scope: Global - cities of all sizes investing in urban greening, heat island mitigation, and stormwater management infrastructure, with particular relevance in dense, rapidly urbanising regions.
Ready to register your
urban green carbon project?
Submit a Project Concept Note under THS v1.0 Annex J to begin your registration. Select the UGR-M code matching your infrastructure format, establish biomass monitoring, and appoint an accredited VVB to validate your PDD.