Do Eco-profiles show which packaging material is best for the environment?

This is a frequent question that is almost impossible to answer.  When looking at environmental criteria - unless each effect is categorised, classified, and ranked in order of societal importance - a clear answer cannot be given.  For example, which is the most important - reduction of global warming gases, fossil fuel depletion rates, consumption of water, emissions to water courses, air emissions, eutrophication of waterways, reduction of ozone depleting gases, or other parameters?
An answer to this question is that there is no clear consensus on ranking.  Even environmental NGOs have no unambiguous priorities.  Each parameter is usually ranked differently; there is no solution that is best for every aspect.However, overall reductions in the listed aspects are generally beneficial.  PET, because of its lightweight and general toughness, requires less packaging material per unit of packaged product, which, in general, reduces the overall environmental burdens.