Emission Factors
We use industry-standard emission factors from authoritative sources:
| Source | Coverage | Updated |
|---|---|---|
| DEFRA 2025 | UK Government conversion factors | Annual |
| GLEC Framework v3.1 | Global freight logistics | 2024 |
| Ember 2025 | Electricity grid data (2024) | Annual |
| Cornell CHSB | Hotel sustainability benchmarks | Annual |
For specific factor values, see our Methodology page or check the source_trail in API responses.