Together, European countries have reduced their greenhouse gas emissions significantly since 1990. Achieving climate neutrality by 2050, however, will demand additional and long-lasting climate mitigation strategies. With materials management accounting for up to two thirds of global greenhouse gas emissions, one promising area for further reductions is the circular economy. A new methodological approach helps to identify circular efforts that can contribute to reducing emissions in any sector and has highlighted key ways to cut emissions in the buildings sector.