• Amount of Carbon Dioxide in the Air is Now Higher Than Any Time in the Last 3,000,000 Years https://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html 96 comments 6/6/2013 worldnews
• Heat-Trapping Gas Passes Milestone, Raising Fears http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?pagewanted=all&_r=0 6 comments 12/5/2013 politics
• Carbon Dioxide Levels Exceed Long-Feared Milestone http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?smid=fb-nytimes&wt.z_sma=sc_cdl_20130510&_r=0 131 comments 11/5/2013 worldnews
• Atmospheric CO2 has reached an average daily level > 400 ppm, a concentration not seen on earth for at least 3 million years. http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?nl=todaysheadlines&emc=edit_th_20130511&_r=0 8 comments 11/5/2013 politics
• The level of carbon dioxide has passed a long-feared milestone not seen on earth for millions of years. http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?nl=todaysheadlines&emc=edit_th_20130511&_r=2& 37 comments 11/5/2013 worldnews
• Carbon Dioxide level now at its highest level in human history http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?smid=re-share 6 comments 10/5/2013 science
• The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone, scientists reported on 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?smid=tw-share&_r=0 6 comments 10/5/2013 politics
• Carbon Dioxide Level is at its highest in human history at a level not seen for at least 3 million years http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?hp&_r=0 5 comments 10/5/2013 worldnews
• The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone 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?pagewanted=all&_r=0 8 comments 10/5/2013 worldnews

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