In Finland, neighbouring Sweden, we also have more different containers for different trash than you'd care for. It takes time to learn all that and when you've finally sorted out all your trash properly to different bins, you sit on your balcony and look at the garbage truck reversing to the yard. The guy goes inside the garbage shed and brings out one bin of certain color, empties it in the truck, and drives away to the next address only to come back a few days later to do the same. When your mind accidentally multiplies this activity by the number of different colored bins you have there, you begin to imagine the local emissions produced by these different trucks circling around all the time, emptying one type of trash each. There are so many bins that each of them must be rather small, so the buffering capacity of the garbage sheds causes excess traffic and pollution due to regular visits by the garbage trucks. Further, some things are collected in certain recycling points, such as non-returnable glass waste like jars and olive oil bottles, which means people take them there with private cars!

For a long time we used to have general waste and compostables. That was quite understandable because you really want the compostables into a separate heap because of...well, composting and you can produce bio gas off composts if the percentage of decomposing waste is high enough. But I'm pretty sure the separation of glass, wood, papers, cardboards etc. could be done in some automated way that reaches a good enough success rate that would make it economically and ecologically viable.