New York Times: Heat-Trapping Gas Passes Milestone, Raising Fears

The average carbon dioxide reading surpassed 400 parts per million at the research facility atop the MaunaLoavolcano on the island of Hawaii for the 24 hours that ended at 8 p.m. on Thursday.

ByJUSTINGILLIS Published: May 10, 2013

The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone, scientists reported Friday, reaching a concentration not seen on the earth for millions of years.

http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html

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