Assurance or verification of environmental information such as greenhouse gas emissions, energy consumption, water and waste management, within an agreed scope.

GHG Protocol
A reference for calculating and evaluating greenhouse gas emissions data, including Scope 1, Scope 2 and Scope 3.
- Scope 1
  Direct emissions from sources the organisation owns or controls, such as fuel combustion and operational vehicles.
- Scope 2
  Indirect emissions from purchased electricity, steam, heat or cooling used by the organisation.
- Scope 3
  Other indirect emissions across the value chain, such as purchased goods, business travel and product use.
ISO 14064
A reference for quantifying and reporting GHG inventories and for verifying and validating GHG statements.
ISO 14016:2020
Guidelines for assurance of environmental information presented in reports, including energy, water and waste data.