2zero - The CO2 calculator

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About this app

2zero is your personal climate app and the officiall Klimathon app. It helps you to actively reduce your carbon footprint with the help of a CO2 calculator & multiple CO2 challenges.
Become part of a Klimathon or our 2Zero community and support our Sustainability Promise. 2zero is the perfect sustainability app for a start into a CO2 neutral future.
Protect the climate together, we show you how!

-I would like to participate in a Klimathon. Am I in the right place?-

You are absolutely right! 2zero (formerly Climate compass) is the official app of the Klimathon. 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. Be ready for 42 days of climate protection!

-How does 2zero work?-

1. Calculate your own ecological footprint
With our CO2 calculator you can easily calculate your ecological footprint. We already offer you a shortened version of the calculator during onboarding. As soon as you have joined your community, you can use the calculator in its full complexity and calculate your customized CO2 footprint. The sustainability calculator was developed in cooperation with the Fraunhofer Institute and the University of Kassel, among others.

2. Master different challenges to reduce your CO2 consumption
More than 160 climate challenges focus on different topics of everyday life. For completing a challenge you receive valuable climate points. Of course, all challenges include detailed information texts that explain the circumstances and effects of the challenge in detail. The data is always up to date thanks to cooperation with Worldwatchers, Frauenhofer.iee, the Wuppertal Institute and the University of Kassel.

3. Get sustainable rewards for your climate protection efforts
Redeem your well-earned climate points for exciting rewards from the sustainability sector. Our partner network is constantly growing, so you can expect new offers on a regular basis.

4. Compete with other climate protectors
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. How much CO2 can you save together?

-Other features-

Have a look at our news section. You can expect exciting news about climate protection actions & events. Our CO2 Challenges are not enough for you? Our guidebook provides you with even more tips & tricks on climate protection & sustainable living.

The Klimathon App provides the collaborative and digital platform to complete our Climate Challenges. The CO2 Calculator and the different CO2 Challenges help you to reduce your ecological footprint. You can either participate in a Klimathon or in our 2Zero Community and take your first steps towards more sustainability.
As your personal climate compass, our sustainability app offers you a great opportunity for sustainable change in everyday life.
Let's go, let's protect the climate together.
Updated on
Sep 19, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 7 others
Data is encrypted in transit
You can request that data be deleted

What's new

Improved Leaderboards & Teams