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Thomas
Life cycle assessment is a powerful tool for analyzing commensurable aspects of quantifiable systems.[153] Not every factor, however, can be reduced to a number and inserted into a model. Rigid system boundaries make accounting for changes in the system difficult.[154] This is sometimes referred to as the boundary critique to systems thinking. The accuracy and availability of data can also contribute to inaccuracy. For instance, data from generic processes may be based on averages, unrepresentative sampling, or outdated results.[155] This is especially the case for the use and end of life phases in the LCA.[156] Additionally, social implications of products are generally lacking in LCAs. Comparative life cycle analysis is often used to determine a better process or product to use. However, because of aspects like differing system boundaries, different statistical information, different product uses, etc., these studies can easily be swayed in favor of one product or process over another in one study and the opposite in another study based on varying parameters and different available data.[157] There are guidelines to help reduce such conflicts in results but the method still provides a lot of room for the researcher to decide what is important, how the product is typically manufactured, and how it is typically used.[158][159]
Economic sustainability is about much more than the sustained growth of resources and profit margins. Economic sustainability takes into account the social and ecological consequences of economic activity. We need to carefully consider the full life-cycle of our goods, from extraction of raw materials, through processing, manufacture, distribution, use, maintenance, repair, and eventual recycling or disposal (the cradle-to-grave paradigm).
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