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Carbon dioxide now at record levels not seen in over 4 million years - The Weather Network
CO2 now comparable to levels seen 4 million years ago: NOAA
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CO2 Past
CO2 now comparable to levels seen 4 million years ago – NOAA – FrontPage
Earth May Be 140 Years Away From Carbon Levels Not Seen In 56 million Years - SpaceRef
Telling Numbers: Carbon dioxide levels are now comparable to 4 million years ago
Climate Milestone: Earth's CO2 Level Passes 400 ppm
2015 saw record increase in atmospheric CO2 levels, NOAA says
El Niño might upset monsoon this year: Report
Atmospheric Carbon Dioxide Growth Rate
