From Fluxes to Footprints: Integrating Net Ecosystem Exchange into Product Carbon MRV

Direct measurements and satellite-derived estimates of Net Ecosystem Exchange (NEE) provide a robust, ecosystem-scale view of land–atmosphere CO₂ dynamics, yet they are rarely connected to product-level carbon accounting frameworks used in policy and markets. This contribution presents a practical, ISO-aligned methodology for integrating NEE into Life Cycle Assessment (LCA) and Product Carbon Footprints, bridging land-based flux measurements with product-based MRV.

The approach replaces generic cultivation-stage emission factors with site-specific NEE data, while preserving full compliance with ISO 14040/44 and ISO 14067. A core boundary-based decision rule ensures carbon mass balance and prevents double counting by explicitly accounting for the fate of harvested biomass carbon. The method is demonstrated across multiple real-world case studies, including oil palm, livestock feed systems, and tobacco production, using both satellite-based and multi-year averaged NEE data.

Results show that integrating NEE substantially improves the climate relevance of product footprints, enabling year-on-year tracking of land management performance and revealing carbon footprint reductions of 19–47% relative to conventional LCAs. Beyond accounting, the framework enables direct translation of flux measurements into decision-relevant indicators for insetting, land management optimization, and supply-chain MRV. The work illustrates how flux science can move from research contexts into scalable, auditable applications with clear societal and market benefits.