This paper discusses the history of the relationship between science education and environmental education in Australian and international contexts and argues that - given the on-going resistances to environmental education in schools, the static nature of science education practices, and declining student interest in studying traditional science subject - it is time to reconsider the relationship. If we are to achieve sustainable development, then science education must have a role in encouraging ecological thinking. However, the science education that can be an appropriate 'host' for environmental education is not necessarily that currently practised, but a reconceptualized form could well be what is needed. From a historical perspective this paper suggests that it might be time to reconsider science education's function as a 'host' for environmental education and try to imagine a more mutualistic relationship.