Supplier CO2 emission calculation method check list.

Obtain supplier's CO2 emission data for the specified time period.

Verify the accuracy and reliability of the data sources.

Ensure all relevant scopes are covered, including direct and indirect emissions.

Collect data on energy consumption, fuel usage, and other relevant factors.

Review the supplier's CO2 emission calculation methodology.

Check if the supplier follows recognized standards or guidelines (e.g., ISO 14064, GHG Protocol).

Ensure the calculation method considers relevant emission factors for each emission source.

Verify if the calculation method includes appropriate conversion factors (e.g., for energy consumption, fuel types, etc.).

Confirm if the supplier's CO2 emission calculation covers all relevant scopes (Scope 1, Scope 2, Scope 3).

Check if the scope categorization aligns with recognized standards or guidelines.

Ensure the supplier includes all significant emission sources, such as energy use, transportation, waste disposal, etc.

Evaluate if the supplier provides clear and transparent documentation of their CO2 emission calculation method.

Check for consistency in reporting across different reporting periods.

Confirm if the supplier maintains records of data sources, calculation formulas, and assumptions used.

Verify if the supplier discloses any limitations or uncertainties associated with their CO2 emissions calculations.

Determine if the supplier's CO2 emissions are independently verified or assured by a third party.

Check if the verification process follows recognized standards or guidelines (e.g., ISO 14064-3).

Verify the credentials and independence of the verifier or assurer.

If no third-party verification is conducted, evaluate if the supplier conducts internal quality checks or peer reviews.

Assess if the supplier has a system in place to monitor and track changes in CO2 emissions over time.

Check if the supplier actively seeks opportunities for emission reduction and sustainable practices.

Evaluate if the supplier sets emission reduction targets and reports progress against those targets.

Determine if the supplier engages in regular communication and collaboration with stakeholders to improve their emission calculation methods.

Note: This is just an example checklist, and you may need to modify or add sections/items based on your specific requirements.