Scope 1 Emissions
Scope 1 emissions are direct greenhouse gas emissions from sources that an organization owns or controls. This includes combustion of fossil fuels in owned boilers, furnaces, and vehicles; process emissions from manufacturing; and fugitive emissions such as refrigerant leaks and methane from owned landfills.
Scope 1 covers all GHG releases that happen within an organization's operational boundary. Common sources include natural gas burned for heating, diesel consumed by company-owned trucks, propane in forklifts, gasoline in fleet vehicles, process emissions from cement or chemical production, and fugitive emissions from HVAC refrigerants or gas pipelines.
Measurement typically relies on fuel purchase records, meter readings, and refrigerant logs. Emission factors from databases like the EPA, DEFRA, or ecoinvent convert fuel quantities and refrigerant weights into tCO₂e.
Scope 1 is usually the most straightforward scope to measure because the data sources are internal. However, organizations with complex manufacturing processes, large vehicle fleets, or distributed facilities can still face significant data collection challenges.
Reducing Scope 1 emissions generally involves fuel switching (e.g., natural gas to electric), process optimization, fleet electrification, equipment upgrades, and better maintenance to reduce fugitive losses.
Frequently asked questions
What are Scope 1 emissions? +
Scope 1 emissions are direct greenhouse gas emissions from sources an organization owns or controls, including fuel combustion in boilers, furnaces, and vehicles; process emissions from manufacturing; and fugitive emissions like refrigerant leaks.
What is an example of Scope 1 emissions? +
Common examples include natural gas burned in company-owned boilers, diesel consumed by owned delivery trucks, propane used in warehouse forklifts, and refrigerant gases leaked from HVAC systems in company facilities.
How do you reduce Scope 1 emissions? +
Reduction strategies include electrifying vehicle fleets, switching from fossil fuels to renewable energy sources for heating, upgrading to more efficient equipment, improving maintenance to reduce fugitive emissions, and optimizing industrial processes.
Related terms
Scope 2 Emissions
Scope 2 emissions are indirect greenhouse gas emissions from the generation of purchased electricity, steam, heating, and cooling consumed by an organization. They are called 'indirect' because the emissions physically occur at the power plant or utility, not at the reporting company's facilities.
Scope 3 Emissions
Scope 3 emissions are all indirect greenhouse gas emissions that occur in an organization's value chain — both upstream (suppliers, purchased goods, business travel, employee commuting) and downstream (product use, end-of-life treatment, investments). Scope 3 typically represents 70–90% of a company's total carbon footprint.
GHG Protocol
The GHG Protocol is the world's most widely used greenhouse gas accounting standard. Developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), it provides frameworks for organizations, cities, and countries to measure and manage their emissions across three scopes.
Carbon Accounting
Carbon accounting is the systematic process of measuring, recording, and reporting the greenhouse gas (GHG) emissions produced by an organization, product, or activity. It follows standardized methodologies — most commonly the GHG Protocol — to quantify emissions across Scope 1 (direct), Scope 2 (purchased energy), and Scope 3 (value chain) categories, producing an auditable inventory that underpins disclosure, reduction planning, and regulatory compliance.
Emission Factor
An emission factor is a coefficient that converts an activity measurement — such as litres of fuel burned, kilowatt-hours of electricity consumed, or dollars spent on a commodity — into a quantity of greenhouse gas emissions, typically expressed in kilograms or tonnes of CO₂ equivalent (tCO₂e).