<Li> value difference between energy inputs is ignored, </Li> <Li> a value ratio is arbitrarily assigned (e.g., a joule of electricity is 2.6 times more valuable than a joule of heat or fuel input), </Li> <Li> the analysis is supplemented by economic (monetary) cost analysis, </Li> <Li> exergy instead of energy can be the metric used for the life cycle analysis . </Li>

What is the second stage in a life cycle assessment