The purpose of this survey was to investigate the relationships between differing perceptions of environmental dangers, underlying values and social structural position of environmentalists and control groups. Attitudinal/Behavioural Questions Probability, seriousness and timing of a possible <i>environmental crisis</i>, scale scores of respondent's perceptions of extent of environmental dangers, industrialism as a way of life, and science and technology; Inglehart's material/post-material value markers; respondent's perceptions of an ideal society; political beliefs and activity. Attitude to taking direct action on environmental issues. Environmentalist organizations, and environmentalist literature read. Background Variables Age, length of post-school education, qualifications and occupation. Environmentalists' questionnaire only: income. Businessmen/Engineers questionnaire only: type of industry.