One CLP Carbon Credit represents one metric tonne of CO2e. CO2e, or carbon dioxide equivalent, is a standard unit for measuring carbon footprint.

There are several different categories of greenhouse gases (GHG). Six GHGs (among which include CO2) are controlled by the Kyoto Protocol and each of them have a different ability to heat the atmosphere. Each GHG’s ability to heat the atmosphere has been formally defined as a multiple of CO2’s ability to heat the atmosphere. This number is referred to as the “Global Warming Potential” (GWP) (e.g. CO2 has a GWP of 1). For simplicity, when calculating GHG emissions, all six GHGs are combined based on their GWP and reported as though they were equivalent to a given volume of CO2. The resulting number is called CO2e.