It just that people are so far removed from the real manufacturing & industrial mining process that they don't care. If they knew how much work it takes to mine enough aluminum for one can, refine it, deal with the waste products, and then move it to the factory, we should all be recycling or reusing all of the aluminum and metal cans.
Plastics and glass are debatable, yet I think they are sorting them now in order to be able to do something with them in the future. We never know when something like pulverized glass mixed in asphalt that makes it last longer will come along.
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