Average reply to 20a: "How often do you make a special effort to sort glass or tins or plastic or newspapers and so on for recycling?". (1) Always, (2) Often, (3) Sometimes, (4) Never. Responses (8) Recycling not available where I live are deleted.

In Environment III (2010) - question 20a.
In Environment II (2000) - question 19a.
In Environment I (1993) - question 19a.

A higher score means that fewer people make an effort to recycle correctly. A lower score means that more people make an effort to recycle correctly.