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Become part of a Klimathon or our cette application community and support our Sustainability Promise. cette application is the perfect sustainability app for a start into a CO2 neutral future. -I would like to participate in a Klimathon. Am I in the right place?  cette application (formerly the Climate Compass) is your personal climate app and the officiall Klimathon app.  You are absolutely right! cette application (formerly Climate compass) is the official app of the Klimathon.  You can either participate in a Klimathon or in our cette application Community and take your first steps towards more sustainability.  The Klimathon App provides the collaborative and digital platform to complete our Climate Challenges.  Fancy a bit of competition? (it's all about climate protection, so there are really only winners here! ) Create your own team or join one of the existing teams and collect climate points for your team.  Redeem your well-earned climate points for exciting rewards from the sustainability sector.  More than 160 climate challenges focus on different topics of everyday life.  You can expect exciting news about climate protection actions & events.  Our guidebook provides you with even more tips & tricks on climate protection & sustainable living.  The CO2 Calculator and the different CO2 Challenges help you to reduce your ecological footprint.  The sustainability calculator was developed in cooperation with the Fraunhofer Institute and the University of Kassel, among others. 2.  It helps you to actively reduce your carbon footprint with the help of a CO2 calculator & multiple CO2 challenges.  Simply select your Klimathon organizer in the Community Selection step of the registration process and you'll be part of your Klimathon, enjoying all the benefits of your community.  For completing a challenge you receive valuable climate points.  As soon as you have joined your community, you can use the calculator in its full complexity and calculate your customized CO2 footprint.