The GHG protocol defines three Scopes to separate different emissions categories.
Scope 1 emissions - direct emissions
Scope 1 emissions are direct greenhouse gas (GHG) emissions that occur from sources that are controlled or owned by your organization (e.g., emissions associated with fuel combustion in boilers, furnaces, vehicles).
Scope 2 emissions - indirect emissions from electricity & heat
Scope 2 emissions are indirect emissions from the production of energy your company purchases and uses (e.g., emissions from electricity generation for your buildings).
Scope 3 upstream emissions - supply chain
Scope 3 emissions encompass greenhouse gas (GHG) emissions that occur in your company’s supply chain. Upstream emissions are those generated by suppliers during the extraction, production, and transportation of raw materials or components used in your organization’s products or services.
Scope 3 downstream emissions
There is also a scope 3 downstream category, that defines emissions that occur further downstream - during sale, use, and disposal of sold products.
