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Sep 102009

(Editor’s note: For the latest development, see environmental activist Bill McKibben’s blog about climate economist Nicholas Stern adopting 350 ppm as the best target level for carbon dioxide in the atmosphere.)

By Ashley Phillips
Green Right Now

What is so significant about the number 350? It is the level scientists have identified as the safe upper limit for carbon dioxide in the atmosphere.

According to, carbon dioxide levels are at 387.81 parts per million at this time. The organization is striving to whittle that number down and will be advocating for a stronger global climate treaty at the U.N.’s Climate Change Conference in Copenhagen this December.

“Getting to 350 means developing a thousand different solutions – all of which will become much easier if we have a global treaty grounded in the latest science and built around the principles of equity and justice,” according to the organization’s website. is organizing a International Day of Climate Action on October 24. So far, 1,378 actions have been registered in 99 countries. You can search for actions in your area or register an action.

Philadelphia is one of the cities signed up to participate. 350philly will be held at 1p.m. on Independence Mall at 5th and Market Streets. Ray Anderson, radical industrialist and environmental heavyweight, will be the keynote speaker. Participants will gather to form the number 350 that will be photographed from the air.

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