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What goes in the blue bin, what goes in the yellow bin, and what do you do with pizza boxes?

Recycling should be straightforward: paper goes in the blue bin; plastics, glass and metal in the yellow bin; dead plants in the green bin and everything else in the red bin - right?

Except it's not always quite that easy. What do you do with mixed packaging? How do you deal with neighbours doing the wrong thing? And what to do with pizza boxes?