- 2015 Begins with CO2 above 400 PPM Mark http://www.scientificamerican.com/article/2015-begins-with-co2-above-400-ppm-mark/ 16 comments worldnews
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- 2015 Begins With CO2 Above 400 PPM Mark | Climate Central http://www.climatecentral.org/news/2015-begins-with-co2-above-400-ppm-mark-18534 3 comments
- The Last Time CO2 Was This High, Humans Didn't Exist | Climate Central https://www.climatecentral.org/news/the-last-time-co2-was-this-high-humans-didnt-exist-15938 1 comment
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