Researchers claim that school has failed to empower children as citizens of the future. To develop a new approach for planning educational practices we need to bring in the students‘ diverse backgrounds in classroom discussions. But in what ways is this possible to do? The aim of this paper is to analyse how children from different socio-cultural contexts bring in their interests, experiences and knowledge in discussions about climate change and reduction of CO2. The data come from a study in which >100 students have discussed global warming from an everyday perspective in focus-groups is used. Five schools, situated in districts with different socio-economic status in the city of Malmö, Sweden have been involved in the study. Two different themes stand out as important for the students‘ discussions; a) effective ways to lower carbon dioxide emission; b) consequences for the students themselves and their families. The discussions reveal that children‘s way to reason in controversial issues are related to their everyday life, they are trying to legitimate their own habits at the same time as they discussing possible sacrifices. Their different living conditions are mirrored in the way they consider the problem, but also in their way of discussing.