Average reply to the question: "Generally speaking, how concerned are you about environmental issues?". (1) Not at all concerned - (5) Very concerned. Replies (8) Can't choose are deleted.

In Environment III (2010) - question 6.
In Environment II (2000) - question not part of the survey.
In Environment I (1993) - question not part of the survey.

A higher score means that more people are concerned about environmental issues. A lower score means that fewer people are concerned about environmental issues.