Become a part of the 2zero community
From small communities to large districts - with the 2zero app you can reach your citizens and create a strong sense of community in climate protection.

Success story -
A climathon in the far north
The climate protection managers from Kiel and Flensburg report on their experiences with 2zero during the joint Climate Marathon in March 2023.
2zero in numbers
43
Climateathons in German municipalities
431
Tons of CO2 emissions saved
105.789
Challenges successfully completed










What other climate protection managers say


Fabian Humpert
City Verl


Laura Düpre
Bad Homburg

Andreas Oeding
City of Flensburg

Review: Regional climate protection with klimo
The regional app klimo is designed to promote low-emission behavior in Kassel, highlight options and reward climate friendliness.

Municipal climate protection - Verl shows how it's done!
Find out in this case study what regional climate protection can look like - The Climate Marathon in Action in Verl!
Are you interested?
Book a no obligation meeting or get an overview of 2zero with our info material
What our app users say
Evaluation from app-internal survey with over 80 submissions
Our scientific partners

Fraunhofer
Together with the Fraunhofer Institute, we have developed our CO2 calculation model and the Challenges

HTW Berlin
We are developing our dynamic footprint and the new tracking features in cooperation with HTW Berlin.

University of Kassel
Together with the University of Kassel, we are conducting studies on the playful learning approach to climate protection
The Klimathon in the press
The program for the Climate Marathon has been presented at Flensburg City Hall. From May 21 to July 2, Flensburg residents can take on 40 climate challenges in app-based competitions. The goal is to save as much CO2 as possible.

As a further incentive to save CO2, there are various prizes to be won. For the actual CO2 savings, participants are rewarded with climate points that allow them to benefit from discounts and promotions offered by partners of the Klimathon.
The "Klimathon" runs via the app "2zero - the CO2 calculator". With it, residents of the three largest cities in Schleswig-Holstein can choose from more than 80 "climate challenges" in six different disciplines to save CO2.
Are you interested?
Book a no obligation meeting or get an overview of 2zero with our info material