400 Parts in a Million: The World’s Biggest Experiment
- 400 ppm official reference – http://dft.ba/-400ppm
- NOAA – http://www.climate.gov” href=”http://www.climate.gov
- UK Met Office – http://metoffice.gov.uk/climate-change
- Climate Central – http://climatecentral.org
- Real Climate – http://realclimate.org
- IPCC FAQs – http://dft.ba/-IPCC
- US Global Change Research Program – http://globalchange.gov
Tags: 2013, Carbon Dioxide, Greenhouse Gas, Video
Categories: Carbon Dioxide (CO2), Greenhouse Gases, Video
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About the Author: Chris Machens

Chris covers the climate since 2011, and when not posting articles to the site he usually works on our next video production.
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