CO2 now comparable to levels seen 4 million years ago: NOAA
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How the World Passed a Carbon Threshold and Why It Matters - Yale E360
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CO2 Now at Levels Unseen in 3.6 Million Years - In These Times
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CO2 Science
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Earth's CO2 Home Page
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Carbon dioxide has hit a level not seen in four million years. This is what it means for the world
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CO2 Past
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Do high levels of CO2 in the past contradict the warming effect of CO2?
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Earth's Atmosphere Passes Significant Carbon Milestone - Dan's Wild Wild Science Journal - AGU Blogosphere
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Carbon dioxide hits highest sustained rate ever recorded as greenhouse gases creep toward uncharted levels, NOAA says - CBS News
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400 ppm World, Part 1: Large Changes Still to Come – State of the Planet
NOAA Climate.Gov - Teaching Climate? This animated visualization represents a time history of atmospheric carbon dioxide in parts per million (ppm) from 1979 to 2016, and then back in time to 800,000
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Climate Change: Atmospheric Carbon Dioxide
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World News: Get all Latest Breaking Global News Stories, Photos & Videos
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Earth May Be 140 Years Away From Carbon Levels Not Seen In 56 million Years - SpaceRef