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On Saturday, over 5,000 groups from around the world gathered for the International Day of Climate Action in an effort to bring attention to the Copenhagen Climate Talks ,scheduled for December when the Kyoto Treaty will be replaced (big question, will the U.S. sign it?).

At issue and of importance is the number 350. That's 350 parts per million, the safe upper limit for carbon dioxide in our air. Anything above that is considered a runway for danger and guess what, we're at 387.

No, that doesn't mean boom, we're dead (obviously). Author Bill Mckibben likens it to going to the doctor. "We're like the patient that goes to the doctor and learns he's overweight, or his cholesterol is too high. He doesn't die immediately—but until he changes his lifestyle and gets back down to the safe' zone, he's at more risk for heart attack or stroke," Mckibben's 350 website explains. The planet is in its danger zone because we've poured too much carbon into the atmosphere, and we're starting to see signs of real trouble: melting ice caps, rapidly spreading drought. We need to scramble back as quickly as we can to safety."