Green Karma - Offset CO2

Contains adsIn-app purchases
13.8K reviews
Content rating
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About this game

Play and collect CO2 cards for various environmental projects. Use them to offset real-life CO2 emissions and get rewarded with top cryptocurrencies.

Open booster packs, play minigames and complete tasks, while helping real life green projects operate.

Introducing Base Carbon Tonne - BCT!
BCT is a carbon index token, backed by various offsets from multiple projects, bridged by the Toucan Protocol. When a player offsets CO2, the game gives BCT rewards at a 1 BCT = 1 Tonne ratio, as well as FONE and a Certificate Card. Each Certificate Card represents a 1kg CO2 offset.

Collect 100 Certificate Cards and mint a personal Offset Certificate in your name! Each certificate has a unique number and also includes your name and the amount of CO2 offset. All your certificates are saved to your profile and you can share them with anyone, or print them.

Each player receives a unique digital CO2 Player Card which keeps track of their personal carbon offset.

Running low on cards?
Visit the Market to swap cards or trade them for FONE.

Game Features:

- Offset real-life CO2 emissions
- Earn BCT and FONE
- Complete Tasks
- Spin the Wheel daily for great rewards
- Gain XP and level up to receive great rewards
- Open Boosters and receive CO2 Cards and Collectibles
- Redeem CO2 Cards for Top Cryptocurrency rewards
- Keep track of the Crypto market with built-in wallets
- Withdraw any coins and tokens to supported wallets
Updated on
Oct 5, 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
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

13.4K reviews
A Google user
April 13, 2020
Great apps from the Phoneum team, I have been enjoying the new update to this one. I have however noticed a small bug in the submarine cleaner game and the planet protector game in the Crypto Planet app respectively (I assume they use the same code), possibly to do with the object collision checking, sometimes as the objects scroll to the side of the screen it is as if they get stuck and fall straight down ending the game immediately. Other than that you guys are doing amazing.
22 people found this review helpful
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Thomas Savage
February 26, 2021
Deciding to give the app a chance; I have been active for a few days but I am not impressed. Far too many bugs in the app it's tough not to feel frustrated by them. Minigames crashing, swaps having a mind of their own (changing what you put in) and errors that completely freeze the app. There are quite a few targets to aim for that feel unobtainable (like a specific item in your collection which cannot be traded) as well as reaching the minimum requirement to withdraw cryptocurrencies ๐Ÿ‘Ž
23 people found this review helpful
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CO2 Cards
February 26, 2021
Please email us at and we will fix it as soon as possible and please adjust your review accordingly ๐Ÿ˜Š ๐Ÿ‘
Steve Swab