GHG Data Units

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Definition

GHG Data Units are the units for expressing Activity Data and GHG Emission Factor value under the GHG Protocol.

The International System of Units (SI units) should be used for measurement and reporting of activity data, and all GHG emissions data shall be reported as metric tonnes of each GHG as well as CO2 equivalents (CO2e).

Where only the latter is available, this shall be clearly identified and justified in order to be in conformance with the GPC Protocol. The same applies where emission factors or emissions data are unavailable for specific gases. CO2e is a universal unit of measurement that accounts for the global warming potential (GWP) when measuring and comparing GHG emissions from different gases. The time period generally used for GWP is 100 years. There are also 20-year GWPs that are available. The GWP remains constant for carbon dioxide over different time frames but there is a significant difference in the values of other gases. GWP 20 may be useful to measure impacts of gases.


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