In this PhD project, my aim is to gain insight into how pupils’ critical mathematics perspectives can be developed by working with climate change in mathematics education. Climate Change is a global challenge. Mathematics plays a key role in both describing, communicate and predicting risk regarding climate change. To investigate how pupils’ can develop critical mathematics perspectives, there will be a research partnership with lower secondary teachers with a particular interest for critical mathematics education and how this can be related to working on climate change in the mathematics classroom. Through conversations and observations, we seek to gain knowledge about how pupils’ critical mathematics perspectives is expressed, and how facilitation of a critical mathematics education can take place through the topic of climate change.