The climate is
changing - are you
changing too?

Das Klima ändert
sich – änderst du
dich auch?

How does our app work


Der Energieverbrauch unseres digitalen Lebens trägt erheblich zur Klimakrise bei. CO₂free ist die erste App*, die deine Klimabilanz aktiv verbessert. Sie hilft dir dabei, dein Handy und bald auch deinen gesamten digitalen Lebensstil CO₂-neutral zu machen.

Wie schützen wir das Klima?

Our process


Unsere App zeigt dir auf einen Blick an, wie viel Treibhausgas die Dateien, Fotos und Videos auf deinem Smartphone verursachen. Außerdem kannst du dein Surfverhalten analysieren und verbessern.


Viele Daten auf deinem Smartphone sind doppelt oder überflüssig – z. B. weil das perfekte Selfie oft nicht beim ersten Versuch gelingt. Unsere App schlägt dir solche Fotos und Videos vor. Du entscheidest selbst, ob du sie löschen willst.


Mit der App kannst du uns zusätzlich beauftragen, deinen verbliebenen CO₂-Fußabdruck zu kompensieren. Als Willkommensbonus erhältst du von uns 1000 Gramm CO₂-Ausgleich geschenkt.

Why CO₂free?

Nichts bedroht unseren Planeten so stark wie der Klimawandel. Die Auswirkungen sind schon heute sichtbar: Starke Stürme und Dürreperioden, schmelzende Polkappen und Überschwemmungen gefährden das Leben vieler Menschen.

Beim Pariser Klimaabkommen im Dezember 2015 einigten sich mehr als 190 Staaten auf Strategien, um CO₂-Emissionen zu verringern. Der Anstieg der weltweiten Durchschnittstemperatur soll dadurch unter 2°C gegenüber vorindustriellen Zeit gehalten werden.

The majority of scientists and climate researchers agree that we ourselves are responsible for the fact that the earth continues to warm up. Since the Industrial Revolution in the 18th century, mankind has increasingly contributed to feeding CO₂ and other heat-trapping gases into the atmosphere. The result: the so-called greenhouse effect, which ensures that less and less sunlight is reflected back out from the earth. This causes the average temperature in the world to rise.

There are numerous ways in which alliances of states and governments are currently trying to halt or at least slow down climate change. For example, the European Union (EU) has decided to reduce its greenhouse gas emissions by at least 40% by 2030 compared to 1990. This is to be achieved, among other things, through the expansion of sustainable energy sources, the strengthening of low-carbon transport and emissions trading that limits the emission of greenhouse gases from industry.

But some companies are also taking extensive measures to combat climate change. For example, some organizations already have rules in place to forego a business flight if in doubt, to produce more energy-efficiently, and to rely more on climate-friendly processes overall in their own supply chain.

And private individuals? They can do something too! Every time you take your bike and leave your car behind, prefer regional and seasonal products when shopping, and use energy-saving lighting, you make a small contribution to climate protection. And the more people do this and carry this attitude into the companies or organizations in which they work, the greater this positive effect will be.

The car trip to the supermarket, the weekend flight to the vacation island, the cruise in the Caribbean - in many areas there is now a much greater awareness that our personal actions leave a smaller or larger CO₂ footprint. Terms like "flight shame" remind us that we ourselves can influence what our impact on the climate looks like.

Less well known: Our digital lifestyle also causes greenhouse gas emissions - and not in short supply: Data stored today on servers and in clouds requires enormous amounts of energy. Facebook alone, for example, emits as much CO₂ as 30,000 citizens in the European Union combined. By 2025, the amount of data generated each year could rise to 175 zettabytes, contributing significantly to the increase in CO₂ emissions in the ICT* sector. By 2040, emissions from this sector could account for 14% of total global emissions.

Too big numbers? Too abstract? Then let's make it concrete here: The global CO₂ footprint of the Internet, for example, is comparable to that of air travel and, at one billion metric tons, is responsible for around 2% of global annual emissions. But it already starts on a small scale, with each and every one of us: If you store 100 cell phone photos in your cloud for a year, you produce just as much CO₂ as traveling 11.5 kilometers by train, while backing up a one-hour video in the cloud emits about as much as a long-distance bus trip between 80-100 kilometers.

*ICT = information - and communications technology
Sources: Information Service of the German Economy (2019); European Commission (2020); Federal Environment Agency (2018, 2020)

How can you get to grips with this problem without renouncing all digital technology? By first analyzing how much CO₂ your smartphone actually causes - and then trying to reduce this figure.

This is exactly where CO₂free comes in: The app determines the ecological footprint of cell phones and gives users the option of deleting superfluous data directly. This reduces the energy consumption of the device as well as that of the cloud services and data centers, thus reducing the burden on the environment. The remaining CO₂ emissions from additional data on the cell phone can be offset directly via CO₂free.

But even independent of CO₂free, users literally have it in their own hands to reduce the impact of their smartphone on the environment: for example, by avoiding unnecessary services, superfluous e-mails, and redundant search queries, and by using social media more consciously.

This is how

our CO₂free App works

Der Energieverbrauch unseres digitalen Lebens trägt erheblich zum Klimawandel bei. CO₂free ist die erste App*, die deine Klimabilanz aktiv verbessert, indem sie dein Handy, und bald auch deinen gesamten digitalen Lebensstil, nahezu klimaneutral macht.

Wie das funktioniert? Unsere App* erkennt überflüssige Daten auf deinem Smartphone und ermöglicht es dir, diese Fotos und Videos mit nur einem Swipe zu löschen. Damit senkst du den Energieverbrauch, den diese Dateien in der Cloud versursachen, und reduzierst CO₂-Emissionen.

Doch die App* bietet dir ein weiteres Tool für noch mehr Klimaschutz…

CO₂free kompensiert deinen digitalen Fußabdruck durch die Stilllegung von CO₂-Zertifikaten – und zwar auf drei Arten:

● CO₂free offsets one kilogram of CO₂ with every download of the app*.

● Du kannst CO₂free beauftragen, deinen CO₂-Fußabdruck, der nach dem Löschen von Daten verblieben ist, auszugleichen.

● Für das Löschen von Daten erhältst du Gutscheine unserer Klimaallianzpartner, die für dich weitere Zertifikate stilllegen.

Our partners

Our supporters