Scope 3 emissions
Scope 3 emissions are all indirect greenhouse gas emissions, other than those included in Scope 2, that occur in the reporting organization’s upstream and downstream value chain. They cover defined categories such as purchased goods, transport, business travel, product use, and investments.
In simple terms
Scope 3 extends an organizational inventory beyond owned or controlled sources and purchased energy. Under the Greenhouse Gas Protocol, its fifteen categories span upstream activities, including purchased goods and employee commuting, and downstream activities, including distribution, use of sold products, and end-of-life treatment. The relevant boundary, data sources, estimation methods, exclusions, and category coverage should be documented. One organization’s Scope 3 emission may be another organization’s Scope 1 or Scope 2 emission.
Why it matters
For many organizations, value-chain activities represent a substantial part of the carbon footprint and expose reduction opportunities that operational inventories alone miss. Scope 3 analysis can inform supplier engagement, product design, logistics, and responsible sourcing. Estimates may carry significant uncertainty, so transparent methods and data-quality improvements matter more than false precision.
Example
For example, an appliance maker can estimate emissions from purchased metals, inbound freight, employee travel, customer electricity use, and product end-of-life. It reports each applicable category separately, explains exclusions, and improves supplier-specific data over time instead of assuming one aggregate estimate is exact.
How it differs
Scope 1 emissions
Scope 3 covers indirect value-chain emissions outside Scope 2; Scope 1 covers direct emissions from sources owned or controlled by the reporting organization.
Scope 2 emissions
Scope 3 excludes the defined Scope 2 category, which covers emissions from generating purchased or acquired electricity, steam, heating, or cooling consumed by the organization.