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Posted Thu May 31 2012: from NOAA, via Christian Science Monitor:
Arctic passes 400 parts per million milestone
Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn't quite a surprise, because it's been rising at an accelerating pace. Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395. So far, only the Arctic has reached that 400 level, but the rest of the world will follow soon.... Before the Industrial Age, levels were around 275 parts per million.... It's been at least 800,000 years -- probably more -- since Earth saw carbon dioxide levels in the 400s, Butler and other climate scientists said.
[Read more stories about: carbon emissions, arctic meltdown, faster than expected]

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'Doc Michael says:
Do they even have milestones on dead-end roads?

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