This article describes how a homework task on climate change is being developed as part of a larger project on sustainability issues -- Urban Science. The ultimate aim of this European project is to improve the teaching of scientific enquiry so that students develop the competences to actively contribute to creating sustainable cities, to understand how cities consist of linked systems that affect each other and to gain scientific skills for employment, thereby becoming more motivated to study science. It was found that students can research and present information in spider diagrams and relate this to everyday life. Although this was at a relatively high level, they were not linking different aspects of climate change. The idea of creating a 'messy wall' from the students' work during stage 1 of the Urban Science project is discussed.