Overview of methods used and results obtained

Bioplastics and LCA - some basic points 6.2.1. Overview of methods used and results obtained 

we can see that the studies published on bioplastics generally look at different impact categories, and rarely with the same computational methods. In addition, we need to take account of the fact that the goals and scopes of the studies are also variable, as are the functional units defined (simple lifecycle inventories as well as complete LCAs can be fonnd some studies are performed from cradle to factory gate for pellets or finished products, whereas other studies also integrate one or more end-of-life scenarios). In such conditions, it is understandable that it is not easy to write a coherent summary of publications relating to LCA of bioplastics in order to provide a simple response to the question Are bioplastics green plastics  

A few ehoice examples can be used to illustrate the diversity of the studies, and to highlight the type of results they produee. 

we can clearly see the importance of defining the system boundaries, and choosing an appropriate functional unit in an LCA. Indeed, if the question is Is it better to package strawberries in PLA, PET or PS , the response given by these results seems to be to avoid PET, but a more detailed analysis may need to be carried out in order to decide between PS and PLA. If, however, the question is Which packaging should be used for strawberries which, after conditioning, are to be shipped the length and breadth of the United States , the response appears to be it makes little difference . 

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