f secondary schools observing CO 2 in the air, The Ne www.rug.nl/fwn/school-CO2-net . Meijer, CIO, University of Groningen ointly with the for Didactics and Educational Development (IDO) Idea: Pupils from secondary schools get hand-on experience with real CO 2 measurements: "CO 2 is for real!" Raises their interest for the global climate issues Raises their interest for science and technology