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[GreenYes] Trends in residuals

There's been a bunch of back and forth about what type of processing is best.  To some degree, it seems to me that the answer to this question likely changes over time -- as markets shift and sorting technology changes. 
Has anybody tracked residuals in detail over a long period of time to get a handle on this?  For example, how much of the degradation caused by mixing fibers at the MRF level can be fixed through better processing at the mill level?  Have the Asian mills improved this technology more than US mills?  Any similar info on plastics? 
Doug Koplow
Earth Track, Inc.
2067 Massachusetts Avenue - 4th Floor
Cambridge, MA  02140
Tel:  617/661-4700
Fax: 617/354-0463

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