EIO-LCA:  Free, Fast, Easy Life Cycle Assessment

The Economic Input-Output Life Cycle Assessment (EIO-LCA) method estimates the materials and energy resources required for, and the environmental emissions resulting from, activities in an economy.  The EIO-LCA method was theorized and developed by economist Wassily Leontief in the 1970s based on his earlier input-output work from the 1930s for which he received the Nobel Prize in Economics.  Researchers at the Green Design Institute of Carnegie Mellon University operationalized Leontief's method in the mid-1990s, once sufficient computing power was widely available to perform the large-scale matrix manipulations required in real-time.  This website takes the EIO-LCA method and transforms it into a user-friendly on-line tool to quickly and easily evaluate a commodity or service, as well as its supply chain.  The results from the EIO-LCA model and this website are free and has suggested citations.

Results from using the EIO-LCA on-line tool provide guidance on the relative impacts of different types of products, materials, services, or industries with respect to resource use and emissions throughout the supply chain.  Thus, the effect of producing an automobile would include not only the impacts at the final assembly facility, but also the impact from mining metal ores, making electronic parts, forming windows, etc. that are needed for parts to build the car. 

The EIO-LCA models available on the site apply the EIO-LCA method to various national and state economies.  Each model is comprised of national economic input-output models and publicly available resource use and emissions data.  Since its inception in 1995, the method has been applied to economic models of the United States for several different years, as well as Canada, Germany, Peru, Spain, and select US states.  The on-line tool has been accessed over 1 million times by researchers, LCA practitioners, business users, students, and others.  Over the past 15 years, we have investigated numerous products, services, and infrastructure systems using LCA as a fundamental component of analysis.  

Scott Matthews CMU