Biodegradation

My daughter went on a field trip to some local wetlands on Friday. The staff there had a pretty informative handout that contained some information on the biodegradability of various objects. I didn't realize, for instance, that an aluminum can might take from 200 to 500 years to biodegrade.

This led me to wonder whether I needed to update my information on biodegradables. Does anyone know of the most recent figures on standard household objects and industrial products (of any kind) such as Styrofoam?

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