Students' understanding of the greenhouse effect, the societal consequences of reducing CO2 emissions and the problem of ozone layer depletion

This study is an attempt to contribute to the growing body of knowledge abo ut students' conceptions and views concerning environmental and natural res ource issues. Answers have been sought to the following questions: "How do Swedish students in grade 9 (15-16 years ord) and grade 12 (18-19 years old ) explain the greenhouse effect?", "How do they think reduction of CO2 emis sion would affect society?" and "How do they explain that the depletion of the ozone layer is a problem?" The method chosen to answer these questions was to give students written tasks of the open-ended type. Five models of t he greenhouse effect appear among the answers, all more or less incomplete, but nevertheless with potential for development. The students' responses a lso indicate that they do not fully understand what fundamental societal ch anges would occur as a result of a drastic reduction in CO2 emission. On th e other hand, they are rather well informed about how injurious depletion o f the ozone layer is to humans. The findings are discussed, including impli cations for teaching. (C) 2000 John Wiley & Sons, Inc.