This questionnaire study was designed to construct novel indices to indicate the quantitative relationship between Greek school students' (n=1.703) willingness to undertake specific pro-environmental actions and their belief in the usefulness of those actions for reducing global warming. For some actions (eg recycling) the extent to which students professed a willingness to act was greater than might be expected, given the degree to which they believed the action would be useful. For others (eg using public rather than private transport) it was less than might be expected. Furthermore, for some actions (eg issues about consumerism) the potential effectiveness of education was weak, indicating that even if people could be persuaded of the usefulness of the action, they might not make changes in their behaviour. For other actions (eg reducing the use of artificial fertilizers) the relationship was stronger; in these areas environmental education could well effect behaviour change.