Popular Mechanics (South Africa) - - Skills -

Poly­isobutene, the base syn­thetic poly­mer in most gum, doesn’t biode­grade. Steam clean­ers with de­ter­gent and steel brushes can va­por­ise it and re­searchers have made a caus­tic en­zyme so­lu­tion used in some cities in Europe. But for now, most just sits in land­fills.

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