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

"The Klimathon has shown us: The 2zero app simplifies the approach and illustrates how much CO2 was saved together. Definitely recommended for other municipalities!"

Fabian Humpert

City Verl

To the Case Study

"We promoted the 2zero app intensively on social media in advance using the materials provided and were able to get a great turnout."

Laura Düpre

Bad Homburg

To the Case Study

"The diversity of content of climate-friendly behavioral measures makes the 2zero app an innovative climate protection tool for behavioral climate protection."

Andreas Oeding

City of Flensburg

To the Case Study

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.

To the Case Study

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!

To the Case Study

Are you interested?

Book a no obligation meeting or get an overview of 2zero with our info material

Book demo

Request info material

The 2zero app engages people to act together to protect the climate

What our app users say

Evaluation from app-internal survey with over 80 submissions

Do you continue to integrate the challenges into your daily routine?

7 from 10

Users continue to reduce CO2

Would you participate in another 2zero initiative?

8 from 10

Users would like to continue using 2zero

Would you recommend 2zero to other communities?

9 from 10

Users recommend the Klimathon

"Simple, beautiful and educational app that allows you to quickly calculate your personal carbon footprint and reduce it sustainably with challenges."

Dörthe

from Flensburg

"Great initiative to raise awareness and actively change the ecological impact of one's lifestyle. Will gladly do it again!"

Gian-Luca

from Verl

"What I liked was the visualization of the footprint and the savings in CO2."

Jan

from Flensburg

"A lot of information summarized compactly, interesting challenges."

Thomas

from Aying

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.