To calculate CEENE values, we quantified the total input exergy
contained in all the types of resources retrieved from the natural
environment and used throughout the cradle to farm gate life cycle.
The CEENE method is coupled to the life cycle inventory database,
ecoinvent, which contains resource use data for several thousands
of processes. Conversion factors, called X factors, were established
in the CEENE method, and this specific for ecoinvent.