> You're right that this has to be accounted for in the energy use, but it's still more
> energy effective to recycle than to throw it out and make new plastic. The one
> virtue of plastic is that it's light, it's actually not very energy intensive to transport.
You've been lied to. All that transportation is environmentally pointless, because
when the plastic gets to its destination, it is not, in fact, actually recycled. It's picked
through by somebody who makes a dollar a day, for the 1% of it that's actually
worth anything, and then the rest of it is either incinerated (in a cheap incinerator
that would never pass inspection in a developed country) or put into a landfill (that,
likewise, would never have passed inspection in a developed country). The end
result is worse for the environment than if the plastic had just been thrown away
in its country of origin.
But, you know, the third-world company that it was all shipped to is willing to *say*
they're a recycling company, if it gets them the contract. There's no law against
lying about stuff like that, in the country they operate in, and even if there were,
it wouldn't be enforced.
> Aluminum is indeed very easy to recycle, but as stated, plastic is light.
The issue with aluminum isn't so much that it's easy to recycle, although it is (most
metals are); the issue is more that it's energy intensive to refine it from ore.
Look up the Hall-Heroult process for an explanation of the details, but the short
version is, high-temperature high-voltage electrolysis.
Plastic is light, but mass-recycling it is borderline impossible with current
technology. You can't just melt it all down and make junk out of it, for two big
reasons. First, there are a gazillion different kinds of plastics, and you'd need
a separate process for each one, and sorting it is impracticable. Second, a
high percentage of plastic is thermoset, i.e., the hardening/curing process
that occurs when it's produced is not straightforwardly reversible.
But sure, if you can somehow collect a whole bunch of one specific uniform type
of thermosoftening plastic, then you could recycle it. This is the trick used for
those plastic recycling projects used for Earth Day celebrations in the schools,
wherein they have all the students bring in a whole bunch of one very specific
plastic object (e.g., milk jugs) and get it turned into a picnic bench or whatever.