[GreenYes] Rigid Plastics take the place of metal and glass containers but

[arthur boone <arboone3@no.address>]

are actually more like paper. A PET soda bottle with a secure lid will go flat in six months because the CO2 gas migrates out through the sidewalls. The materials degrades over time, much like paper (and metqal to a lesser extent). 

There are some groups that have been studying this but I don't have their names. Monica Wilson of GAIA should know them. See above. ARBoone

 
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