350 Postcards Project
Though we strive to keep our campaign up to date with the most cutting edge, open-source, web 2.0 organizing tools, we've decided to start out the 350.org campaign by getting back to basics. So to launch the global open source movement to spread this number, we’ve begun an experimental project to spread the word through one of the oldest forms of communication – the mail. In words, collages, drawings, or any other form on the back of a postcard, we want to hear from people all around the world, why it’s worth it for you, your community, and the rest of the world to aim for 350 parts per million?
Getting to 350 won’t be easy, but is necessary for preserving life as we know it on this planet. Share your reasons for joining this movement with others around the world. We hope that this idea can be a fun, artistic, and educational way for teachers, students, organizers, artists, and anyone else to connect to this global project. Our collective responses will help connect our struggles and serve as inspiration to others to get involved and to keep striving for a brighter future. We'll share your responses on our website, and eventually at the UN climate meetings, when we receive them by electronic or regular mail. Just read the instructions below to get started:
1. Get a postcard. Purchase a postcard or find any roughly mailable material to write on. If needed, cover the back of the postcard with scrap paper to create a clean space to create your response.
2. Find materials. Gather any art supplies or recycled material you may want to complete your postcard. Ideas include paint, crayons, markers, glue, leaves, and old newspapers or magazines.
3. Create your postcard. In words, images, or both, answer the question in one sentence or less, “Why is it worth it for me, my community, and the rest of the world to aim for 350 parts per million?” on the back of the postcard. Remember to include your name and where you're sending it from.
4. Send it in. Mail a scanned image or photo to postcards [at] 350.org or attach a stamp and drop it in the mail to 1370 Mission St., 4th Floor, San Francisco, CA 94103. See your postcard in the global postcard gallery!
5. Pass it on! Send the idea on to your friends around the world to invite them to participate in the project. Check out some of the postcards we've gotten so far for ideas:
350 Animation #2!
The Science of 350
Scientists say that 350 parts per million CO2 in the atmosphere is the safe limit for humanity. Learn more about 350 – what it means, where it came from, and how to get there.
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A Global Day of Climate Action - 24 October

We're planning a global day of action, with events in every corner of the planet--and we need everyone on board
Get started by reading the invitation letter and registering an action in your community.
Want some ideas about the kinds of events you can organize? Just click here.
Current CO2 Levels
350 Messengers
High-profile spokespeople are spreading the 350 message all over the world--click here to see them all. With their help and yours, we'll build this movement.
Friends and Allies

350 isn't one organization, it's a platform--a global network connecting people in every corner of the planet. The 350 network consists of over 200 organizations around the world--click here to check them out. This network gets stronger as it grows--to get your organization involved please e-mail partnerships [at] 350.org
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