Member of an environmental organisation 2010 
Ecological commitment over time 1994-2010 
Definitions/comments
Question wording: “Are you a member of a group or organisation which promotes conservation or protection of the environment?”
Sample size: Umweltsurvey 1994: 2900; 2007: 2790; ISSP 2000: 1501; 2010: 1205.
Source: 1994 and 2007: Swiss Survey on the Environment ETH Zurich; 2000 and 2010: MOSAiCH-ISSP.
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