Carbon Footprint Life Cycle Assessment (LCA

Environmental Science & ESG Reporting: The GHG Protocol Scopes

The Greenhouse Gas Protocol (GHG Protocol), developed by the World Resources Institute (WRI) and World Business Council for Sustainable Development (WBCSD), establishes the global standard for carbon accounting:

• The Three Emission Scopes:

• Scope 1 (Direct Emissions): Greenhouse gases released directly on-site from owned or controlled sources (stationary boilers, natural gas furnaces, and company fleet vehicles).

• Scope 2 (Indirect Upstream Energy): Emissions generated off-site from purchased electricity, steam, heating, and cooling consumed by the organization.

• Scope 3: All other indirect emissions across the upstream and downstream value chain (business travel flights, employee commuting, third-party logistics freight, and end-of-life product disposal).

• Equivalence & Sequestration: According to EPA greenhouse gas equivalencies, one mature urban tree sequesters approximately 21.8 kg of CO_2 per year (~46 trees per metric tonne of CO_2e).

How to Use This Calculator

Enter your Scope 1: Natural Gas Combustion (Therms/Year) (e.g. 800 (Facility heating)), Scope 1: Fleet Fuel Consumption (Gallons/Year) (e.g. 1,200 (Gasoline/diesel vehicles)), Scope 2: Purchased Grid Electricity (kWh/Year) (e.g. 18,000), Scope 3: Commercial Airline Flights (Passenger-Miles/Year) (e.g. 15,000 (Business air travel)), Scope 3: Freight Logistics Transport (Ton-Miles/Year) (e.g. 5,000), and Verified Carbon Offset Credit Price (/Metric Tonne CO2e) (e.g. 25 (25.00/tCO2e)). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

GHG Protocol Corporate Accounting \& Life Cycle Assessment (LCA) equations:

Scope 1 (tCO_2e) = ((Therms Gas × 5.302) + (Gallons Fuel × 8.887)) / (1,000)

Scope 2 (tCO_2e) = (Grid Electricity (kWh) × 0.386) / (1,000)

Scope 3 (tCO_2e) = ((Air Passenger-Miles × 0.155) + (Freight Ton-Miles × 0.161)) / (1,000)

Total Carbon Footprint = Scope 1 + Scope 2 + Scope 3 (Metric Tonnes CO_2e)

Carbon Offset Cost = Total tCO_2e × Offset Price per Tonne

Worked Example

For example, an organization burning 800 therms natural gas (4.24 tCO_2e), 1,200 gallons gasoline (10.66 tCO_2e), purchasing 18,000 kWh electricity (6.95 tCO_2e), and flying 15,000 air miles with 5,000 freight ton-miles (3.13 tCO_2e): Scope 1 is 14.90 tCO_2e (59.6%), Scope 2 is 6.95 tCO_2e (27.8%), and Scope 3 is 3.13 tCO_2e (12.5%). Total Annual Footprint is 24.98 Metric Tonnes CO_2e, requiring 1,147 tree seedlings or \624.50/year in certified carbon offsets at .

Understanding Your Result

Automotive benchmarks for reference: engine displacement affects power density (target 100+ hp/liter for performance), power-to-weight ratio above 0.1 hp/lb is considered sporty. Tire sizing: the middle number (e.g., 60 in 225/60R17) is the aspect ratio — lower numbers indicate sportier, wider tires with less cushioning. Braking distance from 60 mph: average car 120–140 ft on dry pavement; wet roads add 40–60%. Fuel efficiency varies significantly by driving style — aggressive acceleration and braking can reduce MPG by 15–30%.