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400 ppm of CO2 was just another line in the sand, and we’re not stopping there

We have spent the entirety of calendar year 2016 above 400 ppm atmospheric carbon dioxide. If you aren't concerned, you aren't paying attention.
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400 ppm carbon dioxide? In my atmosphere?

Humor : Boing Boing

It's true, at least for today. Although the real concern in climate science is average concentrations of carbon dioxide over much longer periods of time, surpassing the 400 ppm mark, even for a day, is a historic milestone. 400 ppm ...

CO2 levels likely to stay above 400ppm for the rest of our lives, new study shows

Lifestyle / Green Living : Inhabitat

A new study reveals that carbon dioxide (CO2) concentrations in the atmosphere are likely to remain above 400 parts per million (ppm) throughout this year and for many years to come. Scientists from the Met Office Hadley Centre and ...

New Milestone for CO2 Levels: Mauna Loa Observatory Records 400 PPM

Technology : Technology Review Editors' Blog

We’ve hit 400 ppm of carbon dioxide, but we won’t know what that means for decades. The National Oceanic and Atmospheric Administration and Scripps Institution of Oceanography say that the carbon dioxide concentration in the atmosph...

We Just Passed A Grim Carbon Dioxide Threshold, Possibly For Good

News : Huffington Post

The world has hit a global warming milestone it may never recover from. Scientists at the Mauna Loa Observatory in Hawaii announced in 2013 that atmospheric concentrations of carbon dioxide reached a daily average above 400 parts pe...

Climate One-Two Punch: During the Hottest Year Ever, the World May Never Return Below 400ppm CO2

Issues & Causes / Climate Change : Greentech Media

Climate Central: The World Passes 400 PPM Threshold. Permanently In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world’s climate. At a time when atmospheric carbon dioxide...


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