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"Polyethylene Pam" and “Plastic Fantastic
Lover” were popular songs by two famous rock bands from the 1960s - the Beatles
and the Jefferson Airplane. Both songs revealed plastic’s association with
soulless superficiality. But this ‘bad rap’ reputation has been superceded by
the ‘good rap’ attributes offered by its chameleon-like molecules that can be
rearranged to form polyethylene, acrylic, silicone, urethane, Plexiglas,
Lucite, nylon, and so forth. Plastics are light, durable, shatterproof, and unaffected
by water. They offer excellent thermal and electrical insulation properties. In
addition, they are relatively energy efficient to produce. For all these
reasons plastics can be used for everything from throwaway bags to combat
aircraft. Plastic’s popularity is evident in the fact that it accounts for
11.3%[i]
of the total volume of trash, more than glass, metals, wood, or textiles.
Because of its significance in our lives and its prevalence in our refuse, our
era may become known as the Plasticene Age.
Plastics are polymers, which are long chains of
similar molecules. Most are manufactured from petroleum products. This fact
accounts for three major environmental concerns related to the use of plastics.
One involves the depletion of nonrenewable natural resources. The other is the
environmental impact associated with the extraction of oil, the refining
process, and the subsequent manufacturing of plastics. The third is managing
plastic waste.
Future archeologists studying the Plasticene Age
are likely to discover a surplus of material artifacts. This is because no
bacteria or fungi have jaws that are big enough to eat its long-chain
molecules. Thus, despite the fact that they are made from the organic molecules
that originated from early life forms, plastics are mostly immune to the
biodegrading cycle that replenishes the earth’s supplies of nutrients. In
addition, plastic’s amazing variety complicates conventional
recycling programs. Different kinds of resins that demand different
methods of reprocessing are utilized for peanut butter jars, milk jugs, shrink
wrap, trash bags, drinking straws, and meat trays. This complicates automated
sorting. To help deal with this problem, the plastics packaging industry has
developed symbols to designate different kinds of resins. However, sorting is
further complicated because many items are fabricated out of different sorts of
plastics. Others combine plastic and non-plastic components. Recycling both
kinds of items entails dismantling before reutilization can proceed.
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