How the World Passed a Carbon Threshold and Why It Matters - Yale E360
Climate Fresk - Card 'Concentration of CO2 (ppm)'
Climate Milestone: Earth's CO2 Level Passes 400 ppm | National Geographic Society
Starting Later This Year, 400 and Up is Likely to Be the New Normal for CO2 Measurements - The New York Times
Observed concentrations of CO2 cross 400 parts per million threshold at several Global Atmosphere Watch stations | World Meteorological Organization
What does 400 ppm look like? — Carbon Visuals
NASA Climate on Twitter: "Carbon dioxide is giving Earth a jolt! Did you know there's about 400 parts per million (ppm) of caffeine in coffee? There's over 400 ppm of CO₂ in
400 PPM. So what. - The Energy Miser
Atmospheric Carbon Dioxide Levels Just Passed The 410 PPM Mark - CleanTechnica
Crossing Carbon Threshold at 415 ppm: What Does It Mean?
What Passing a Key CO2 Mark Means to Climate Scientists | Climate Central
February carbon dioxide levels average 400ppm for first time – ECOS
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Carbon dioxide crosses 400 ppm mark
2013 State of the Climate: Carbon dioxide tops 400 ppm | NOAA Climate.gov
How the World Passed a Carbon Threshold and Why It Matters - Yale E360
Carbon Dioxide Could Reach Unseen Heights – 410 PPM – This Month | The Weather Channel
The effect of carbon dioxide (400, 800, 1200 ppm), aw (0.92, 0.95, 0.98... | Download Scientific Diagram
What does 400 ppm look like? — Carbon Visuals
What does 400 ppm look like? — Carbon Visuals
The final days of sub-400 ppm carbon dioxide - Mountain Beltway - AGU Blogosphere
Climate Milestone: Earth's CO2 Level Nears 400 ppm
Peter Gleick: An Inevitable Headline in 2014 — 'Planet's CO2 Level Reaches 400 ppm for First Time in Human Existence' - Circle of Blue
What does 400 ppm look like? — Carbon Visuals
Carbon Dioxide Passes 400 PPM Milestone, NOAA Finds | Climate Central
