Earlier quoted context omitted.
Just fyi, this was completely intentional [1]. There was a big concern about increasing plastic use in the 1990s. So, the plastics producers started producing ads and adding the recycling symbol to plastics. The consumer assumed they were doing "good" and left it for the municipalities and recyclers to figure out or to just dump in the landfill. A lot of plastics can be shredded up and reused to some degree but not r…
> we need to be recycling only aluminum and cardboard And glass?
In short because glass breaks and contaminates paper and aluminum plus needs to be sorted by color it costs too much to handle and economics are more important than environmental externalities.