2zero Climathon

2zero Climathon (formerly Climate Compass) is your personal climate app and the official Klimathon app. It helps you actively reduce your carbon footprint with a CO2 calculator and 160+ climate challenges. Join the 2Zero community and participate in Klimathons to support our Sustainability Promise and protect the climate together.

How it works: calculate your ecological footprint using our CO2 calculator (developed in collaboration with Fraunhofer Institute and the University of Kassel), master more than 160 challenges, and earn climate points that can be redeemed for rewards. You can form or join teams to compete and see who saves the most CO2, plus stay informed through the News section and a practical guidebook on sustainable living.