Version v1.1.0 (Active) & v1.0.0 (Historical Snapshot)IPCC AR5 (GWP100) Basis14 Verified Factors (11 Exact, 3 With Explicit Gas/Boundary Flag)

GetSustainable.ai Partial-Scope Corporate GHG Screening Methodology v1.1.0

Name: GetSustainable.ai Partial-Scope Corporate GHG Screening Methodology v1.1.0
Creator: GetSustainable.ai
Published: 2026-10-17T00:00:00.000Z

Aligned with the WRI/WBCSD Greenhouse Gas Protocol Corporate Accounting and Reporting Standard, Scope 2 Guidance (2015), and Corporate Value Chain (Scope 3) Standard. Every calculation run is deterministic, version-pinned (v1.1.0 or v1.0.0), and reproducible from its SHA-256 input hash.

Mandatory Partial-Scope Boundary Disclaimer:SCREENING ESTIMATE ONLY — NOT A COMPLETE CORPORATE GHG INVENTORY. This calculation covers only selected Scope 1 stationary combustion, Scope 1 company-owned vehicle fuel consumption, Scope 2 location-based purchased electricity, and (where enabled) optional Scope 3 Category 6 business travel. It excludes fugitive emissions (refrigerants), process emissions, Scope 2 market-based contractual instrument hierarchy verification, and the remaining 14 Scope 3 categories defined by the WRI/WBCSD GHG Protocol Corporate Value Chain (Scope 3) Standard.

Scientific Audit & Methodology Evolution: `v1.0.0` → `v1.1.0`

1. UK DESNZ 2024 Petrol Resolution

2.09747 vs. 2.07049 kg CO2e / liter

In v1.0.0, EF-UK-PETROL-VEH-L-2024 carried 2.09747 kg CO2e/L (the UK DESNZ 2023 average biofuel blend schedule: 2.08390 CO2 + 0.00682 CH4 + 0.00675 N2O). In v1.1.0 (EF-UK-PETROL-VEH-L-2024-V11), this is updated to the exact UK DESNZ 2024 v1.1 value of 2.07049 kg CO2e/L (2.05692 CO2 + 0.00682 CH4 + 0.00675 N2O), reflecting higher UK RTFO bioethanol blending while preserving v1.0.0 for historical run reproducibility.

2. US EPA Table 2 CO2-Only Distinction

CO2_ONLY_EXPLICIT vs. FULL_KYOTO_CO2E

US EPA GHG Emission Factors Hub Table 2 provides fuel-volume CO2-only factors (8.78 kg CO2/gal gasoline; 10.21 kg CO2/gal diesel), whereas mobile CH4 and N2O in EPA Table 3 depend on vehicle control technology, model year, and mileage (VMT). Engine v1.1.0 explicitly tags these factors with gasCoverage: CO2_ONLY_EXPLICIT and emits a structured methodological warning.

3. Dubai DEWA Sub-National Boundary (AE-DU)

Emirate-Specific Grid Attribution

In the UAE, grid electricity generation is utility-specific: DEWA serves the Emirate of Dubai (0.4041 kg CO2e/kWh in 2023), while EWEC serves Abu Dhabi (AE-AZ) with a distinct nuclear and solar generation mix. In v1.1.0, the DEWA factor is scoped strictly to AE-DU (EF-UAE-DEWA-ELEC-LOC-KWH-2023), and generic AE electricity inputs return SUBNATIONAL_GEOGRAPHY_REQUIRED.

1. Operational Scope Boundaries

Scope 1 — Stationary Combustion (Included):Natural gas (kWh, m3, therms) and stationary mineral diesel / gas oil (liters) combusted in boilers, furnaces, or backup generators.
Scope 1 — Mobile Combustion (Included):Company-owned or operationally controlled vehicle fleet fuel consumption across diesel, petrol, and US motor gasoline (liters, us_gallons).
Scope 2 — Purchased Electricity, Location-Based (Included):Grid-average generation emission factors for United Kingdom (GB), United States (US), and Dubai DEWA Grid (AE-DU in v1.1.0; AE in v1.0.0) in kWh.
Optional Scope 3 Category 6 — Business Travel (Strictly Separated):Short-haul economy flights, long-haul economy flights (including radiative forcing), and national rail in passenger_km. Reported in a dedicated Scope 3 ledger and never merged into scope1And2TotalKgCo2e.

2. Deterministic Equations & Non-Substitution Policy

E_item (kg CO2e) = round_6(Q_activity × EF_total)

E_CO2 (kg) = round_6(Q_activity × EF_CO2)

E_CH4 (kg CO2e) = round_6(Q_activity × EF_CH4)

E_N2O (kg CO2e) = round_6(Q_activity × EF_N2O)

Scope1And2_Total = Scope1_Total + Scope2_Location_Total

Strict Non-Substitution & Category/Sub-National Guards

When an activity item requests a country, fuel/activity type, or unit combination that does not exist in the version-pinned factor register, the engine never silently substitutes another country's factor. It returns MISSING_FACTOR_FOR_GEOGRAPHY, SUBNATIONAL_GEOGRAPHY_REQUIRED, or UNSUPPORTED_CATEGORY_FUEL_COMBINATION and increments unresolvedItemsCount.

Launch Corporate GHG Screening Calculator →

3. Authoritative Primary Factor Sources (3)

Source Code	Dataset Name	Issuing Authority	Dataset Version	GWP Basis	Official URL
SRC-UK-DESNZ-2024	UK Government GHG Conversion Factors for Company Reporting 2024	UK Department for Energy Security and Net Zero (DESNZ) & DEFRA	2024 v1.1	IPCC_AR5	Verify Source &nearr;
SRC-US-EPA-2024	US EPA GHG Emission Factors Hub 2024	United States Environmental Protection Agency (EPA)	April 2024 (eGRID 2022)	IPCC_AR5	Verify Source &nearr;
SRC-UAE-MOCCAE-DEWA-2023	UAE Grid Emission Factor — DEWA Sustainability Report 2023 / MoCCAE	Dubai Electricity and Water Authority (DEWA) / UAE Ministry of Climate Change and Environment (MoCCAE)	2023 Operating Year (Published 2024)	IPCC_AR5	Verify Source &nearr;

4. Complete Verified Emission Factor Register — v1.1.0 (14 Factors)

Every factor includes gas coverage classification (FULL_KYOTO_CO2E, CO2_ONLY_EXPLICIT, or AGGREGATE_CO2E_UNSPECIFIED_CH4_N2O), gas-by-gas breakdown, uncertainty bounds, and independent scientific audit notes.

Factor Code	Scope & Activity	Geo / Year	Total kg CO2e / Unit	Gas Coverage & Constituents	Verification Status & Audit Note
EF-UK-NATGAS-KWH-2024SRC-UK-DESNZ-2024	SCOPE_1 natural_gas scope_1_stationary	GB (2024)	0.1829 kg / kWh ±2.5% uncertainty	FULL_KYOTO_CO2E CO2: 0.18254 CH4: 0.00026 N2O: 0.0001	INDEPENDENTLY_VERIFIED_EXACT Verified exact match against UK DESNZ 2024 Gaseous Fuels (Gross CV: 0.18290 kg CO2e/kWh).
EF-UK-NATGAS-M3-2024SRC-UK-DESNZ-2024	SCOPE_1 natural_gas scope_1_stationary	GB (2024)	2.02996 kg / m3 ±2.5% uncertainty	FULL_KYOTO_CO2E CO2: 2.02596 CH4: 0.00288 N2O: 0.00112	INDEPENDENTLY_VERIFIED_EXACT Verified against UK DESNZ Gaseous Fuels Natural Gas (Gross CV) per cubic meter.
EF-UK-DIESEL-STAT-L-2024SRC-UK-DESNZ-2024	SCOPE_1 stationary_diesel scope_1_stationary	GB (2024)	2.70553 kg / liters ±3% uncertainty	FULL_KYOTO_CO2E CO2: 2.66772 CH4: 0.00297 N2O: 0.03484	INDEPENDENTLY_VERIFIED_EXACT Verified against UK DESNZ Liquid Fuels (100% mineral diesel / gas oil stationary combustion per liter).
EF-US-NATGAS-THERM-2024SRC-US-EPA-2024	SCOPE_1 natural_gas scope_1_stationary	US (2024)	5.3114 kg / therms ±2.5% uncertainty	FULL_KYOTO_CO2E CO2: 5.306 CH4: 0.0025 N2O: 0.0029	INDEPENDENTLY_VERIFIED_EXACT Verified against US EPA Hub Table 1 (53.06 kg CO2/MMBtu + 1.0 g CH4/MMBtu * 28 + 0.1 g N2O/MMBtu * 265 = 53.1145 kg CO2e/MMBtu -> 5.3114 kg CO2e/therm).
EF-UK-DIESEL-VEH-L-2024SRC-UK-DESNZ-2024	SCOPE_1 vehicle_diesel scope_1_mobile	GB (2024)	2.51233 kg / liters ±3% uncertainty	FULL_KYOTO_CO2E CO2: 2.47651 CH4: 0.00028 N2O: 0.03554	INDEPENDENTLY_VERIFIED_EXACT Verified exact match against UK DESNZ Liquid Fuels -> Diesel (average biofuel blend: 2.51233 kg CO2e/liter).
EF-UK-PETROL-VEH-L-2024-V11SRC-UK-DESNZ-2024	SCOPE_1 vehicle_petrol scope_1_mobile	GB (2024)	2.07049 kg / liters ±3% uncertainty	FULL_KYOTO_CO2E CO2: 2.05692 CH4: 0.00682 N2O: 0.00675	INDEPENDENTLY_VERIFIED_EXACT RESOLVED IN v1.1.0: Updated from 2023 schedule value (2.09747 kg CO2e/L = 2.08390 CO2 + 0.00682 CH4 + 0.00675 N2O) to the exact UK DESNZ 2024 v1.1 biofuel-blend value (2.07049 kg CO2e/L = 2.05692 CO2 + 0.00682 CH4 + 0.00675 N2O), reflecting higher UK RTFO bioethanol blending.
EF-US-GASOLINE-GAL-2024SRC-US-EPA-2024	SCOPE_1 vehicle_gasoline scope_1_mobile	US (2024)	8.78 kg / us_gallons ±3% uncertainty	CO2_ONLY_EXPLICIT CO2: 8.78 CH4: 0 N2O: 0	VERIFIED_WITH_METHODOLOGY_FLAG FLAGGED GAS COVERAGE NOTE: Verified exact match against US EPA Hub Table 2 (8.78 kg CO2/gallon). Per EPA methodology, mobile CH4 and N2O require vehicle-miles traveled (Table 3) and are excluded in fuel-volume-only screening.
EF-US-DIESEL-GAL-2024SRC-US-EPA-2024	SCOPE_1 vehicle_diesel scope_1_mobile	US (2024)	10.21 kg / us_gallons ±3% uncertainty	CO2_ONLY_EXPLICIT CO2: 10.21 CH4: 0 N2O: 0	VERIFIED_WITH_METHODOLOGY_FLAG FLAGGED GAS COVERAGE NOTE: Verified exact match against US EPA Hub Table 2 (10.21 kg CO2/gallon). Per EPA methodology, mobile CH4 and N2O require vehicle-miles traveled (Table 3) and are excluded in fuel-volume-only screening.
EF-UK-ELEC-LOC-KWH-2024SRC-UK-DESNZ-2024	SCOPE_2 grid_electricity_location scope_2_electricity	GB (2024)	0.20705 kg / kWh ±5% uncertainty	FULL_KYOTO_CO2E CO2: 0.20493 CH4: 0.0009 N2O: 0.00122	INDEPENDENTLY_VERIFIED_EXACT Verified exact match against UK DESNZ 2024 UK Electricity generation factor (0.20705 kg CO2e/kWh; excludes Scope 3 T&D losses of 0.01830 kg CO2e/kWh).
EF-US-ELEC-LOC-KWH-2024SRC-US-EPA-2024	SCOPE_2 grid_electricity_location scope_2_electricity	US (2024)	0.38873 kg / kWh ±6% uncertainty	FULL_KYOTO_CO2E CO2: 0.3865 CH4: 0.00095 N2O: 0.00128	INDEPENDENTLY_VERIFIED_EXACT Verified against US EPA Hub 2024 Table 6 (eGRID 2022 US National Average: 857.0 lb CO2e/MWh * 0.45359237 kg/lb / 1000 = 0.388729 kg CO2e/kWh).
EF-UAE-DEWA-ELEC-LOC-KWH-2023SRC-UAE-MOCCAE-DEWA-2023	SCOPE_2 grid_electricity_location scope_2_electricity	AE-DU (2023)	0.4041 kg / kWh ±5% uncertainty	AGGREGATE_CO2E_UNSPECIFIED_CH4_N2O CO2: 0.4041 CH4: 0 N2O: 0	VERIFIED_WITH_METHODOLOGY_FLAG SCOPED TO DUBAI (AE-DU) IN v1.1.0: DEWA operates the Dubai grid (0.4041 tCO2e/MWh in 2023), whereas Abu Dhabi & Northern Emirates are served by EWEC/TRANSCO with distinct nuclear/solar fuel mixes. Generic 'AE' is rejected in v1.1.0 with SUBNATIONAL_GEOGRAPHY_REQUIRED.
EF-UK-FLIGHT-SHORTHAUL-ECO-PKM-2024SRC-UK-DESNZ-2024	SCOPE_3 flight_short_haul_economy scope_3_business_travel	GB (2024)	0.18592 kg / passenger_km ±15% uncertainty	FULL_KYOTO_CO2E CO2: 0.184 CH4: 0.0001 N2O: 0.00182	INDEPENDENTLY_VERIFIED_EXACT Verified exact match against UK DESNZ Business Travel - Air (Short-haul to/from UK, economy class, including radiative forcing: 0.18592 kg CO2e/pkm).
EF-UK-FLIGHT-LONGHAUL-ECO-PKM-2024SRC-UK-DESNZ-2024	SCOPE_3 flight_long_haul_economy scope_3_business_travel	GB (2024)	0.20011 kg / passenger_km ±15% uncertainty	FULL_KYOTO_CO2E CO2: 0.19815 CH4: 0.00008 N2O: 0.00188	INDEPENDENTLY_VERIFIED_EXACT Verified against UK DESNZ Business Travel - Air (Long-haul economy class, including radiative forcing: 0.20011 kg CO2e/pkm).
EF-UK-RAIL-NATIONAL-PKM-2024SRC-UK-DESNZ-2024	SCOPE_3 national_rail scope_3_business_travel	GB (2024)	0.03546 kg / passenger_km ±5% uncertainty	FULL_KYOTO_CO2E CO2: 0.0351 CH4: 0.00007 N2O: 0.00029	INDEPENDENTLY_VERIFIED_EXACT Verified exact match against UK DESNZ Business Travel - Land -> National rail (0.03546 kg CO2e/pkm).

Scientific Audit & Methodology Evolution: v1.0.0 → v1.1.0