Here is the list of impact criteria implemented in the API.
GWP - Global warming potential
What : Global warming potential (GWP) is the heat absorbed by any greenhouse gas in the atmosphere, as a multiple of the heat that would be absorbed by the same mass of carbon dioxide (CO2). GWP is 1 for CO2. For other gases it depends on the gas and the time frame.
Source : https://en.wikipedia.org/wiki/Global_warming_potential
Unit : kgCO2e
PE - Primary energy
What : Primary energy (PE) is an energy form found in nature that has not been subjected to any human engineered conversion process. It is energy contained in raw fuels, and other forms of energy, including waste, received as input to a system. Primary energy can be non-renewable or renewable.
Source : https://en.wikipedia.org/wiki/Primary_energy
Unit : MJ
ADP - Abiotic Depletion Potential
What : Abiotic Depletion Potential (ADP) is an environmental impact indicator. This category corresponds to mineral and resources used and is, in this sense, mainly influenced by the rate of resources extracted. The effect of this consumption on their depletion is estimated according to their availability stock at a global scale. This impact category is divided into two components: a material component and a fossil fuels component (we use a version of ADP which include both).
Unit : KgSbeq