Vincent Dert 

The first universally standardized and first-principal-based system of methods was developed to calculate the environmental (E) and human condition (H) impacts embodied by products and services where EH-impacts originating from employee labor are added to other production process EH-impacts. While the addition of employee labor EH-impacts is essential to correctly calculate the EH-impacts of products and services, this leads to double counting of some of the same EH-impacts under non-sustainable conditions. Without correction this would lead to an incorrect calculation of the EH-impacts for products and services and to supply chain accumulation of E-impacts. An excess impact deduction (XID) calculation method was developed to remove any excess E-impacts and prevent supply chain accumulation. The method applies universally to all products and services.
Together with the personal sustainable absorption (PSA) calculation method, the XID calculation method allows the calculation of the required conservation to neutralize damaging environmental impacts for each product or service. While these conservations are increasingly applied, their cost will create incentives to prevent damaging impacts, over time leading to adequate protection and restoration of all environmental systems.