A community for practical green participation.
ZCO brings people, creative culture and zero-carbon technology together around one idea: meaningful climate participation begins with actions people can understand, complete and share.
Action before promises.
ZCO is an early-stage global community experiment. We make participation approachable through green challenges, useful tools, community recognition and open learning. Growth should come from real use and shared values rather than financial speculation.
Understand
Play Guess Carbon with sourced climate data, or follow Zumi through everyday choices in Green Journey.
Participate
Start with one green action and submit a short record for review. There is no multi-day commitment; sharing and inviting others are optional.
Contribute
Explore zero-carbon technology, try the tools and share useful feedback to help the community improve through real use.
ZCS records participation.
ZCO Green Score (ZCS) is a community participation record for activities such as learning, creating, challenges and useful contributions. It can help recognize people who show up and take part.
ZCS is not money.
It is not a token, carbon credit, verified carbon reduction or financial asset. Any future Web3 structure would only be evaluated after the community and real use are validated.
Explore the data. Understand the limits.
Three tools support different questions. Their data sources, assumptions and boundaries matter as much as their results.
See the bigger picture
Explore greenhouse gas estimates, fossil CO₂ history, satellite observations and Great Britain’s electricity carbon intensity.
Trace your inputs
Organise activity data and emission factors, review calculation boundaries and export your records. Calculations stay in your browser.
Explore energy options
Collect island energy information and screen solar, wind, storage and diesel scenarios before detailed professional assessment.
Small games. Bigger curiosity.
Guess Carbon reveals the numbers behind each answer, with sources to explore further. Green Journey follows Zumi through everyday choices. Both are open to play without an account.
Meet Zumi, our community companion.
Known in Chinese as 祖米, Zumi brings warmth and curiosity to our games, challenges and community creativity. Game results describe a play session; they are not a measure of your real-world environmental impact.
Claims should be specific and verifiable.
ZCO does not equate a community point or brand unit with one tonne of carbon reduction. Screening tools are not engineering designs. Participation records are not verified offsets. The ZCO Token has not launched.