 AI, the area needed to provide the infrastructure for the process is the sum (formula 3) of direct land use (AID) and the area needed to provide the area for buildings and process plants (AII).AS is the area needed for the supply of the staff and AP is the area needed for a sustainable embedding of emissions and waste into ecosphere.The SPI aggregates partial footprints from mass, energy and emission inventories of every sub-process and refers them to the end product.