On October 24th ordinary citizens will come together in a series of events, rallies, demonstrations and public art projects all designed to do one thing: bring awareness to an important number -- 350 parts per million of carbon dioxide.
During the last two years, the scientific community has made very clear that it's the maximum safe level for carbon in the atmosphere, at least if we want to have a planet "similar to the one on which civilization developed and to which life on Earth is adapted."
In more than 130 countries, people are organizing thousands of actions that will take those three digits and sear them into the planet's consciousness.
On the melting slopes of Mt. Everest, Pemba Dorje Sherpa, who holds the record for the fastest ascent of the world's highest peak, will be spreading banners and signs.
On the dying coral reefs of the Maldives, the government's entire cabinet will don scuba gear and hold an official underwater meeting to pass a 350 resolution to send to the Copenhagen summit.
On the shores of the fast-drying Dead Sea, Israeli activists will form a giant human "3" on their beach, Palestinians a "5" on theirs, and Jordanians a "0" - reminding us we need to unite on this vital issue.