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Carbon dioxide levels cross 400 ppm threshold, highest in millions of years.  
Carbon dioxide levels cross 400 ppm threshold, highest in millions of years.  


[https://www.scientificamerican.com/report/400-ppm-and-climate-change/ '''400 PPM: What's Next for a Warming Planet''']
[https://www.scientificamerican.com/report/400-ppm-and-climate-change/ '''''400 PPM: What's Next for a Warming Planet / Smithsonian''''']


:Concentrations of greenhouse gases in the atmosphere have reached this level for the first time in millions of years. What does this portend?
:''Concentrations of greenhouse gases in the atmosphere have reached this level for the first time in millions of years. What does this portend?''


:As the [http://www.greenpolicy360.net/w/Earth_and_Space,_Politics US House Committee on Science disagrees with climate science consensus], NASA’s chief climate scientist, Gavin Schmidt, is not optimistic: “In my opinion, we won’t ever see a month below 400 ppm”
:As the [http://www.greenpolicy360.net/w/Earth_and_Space,_Politics US House Committee on Science disagrees with climate science consensus], NASA’s chief climate scientist, Gavin Schmidt, is not optimistic: “In my opinion, we won’t ever see a month below 400 ppm”

Revision as of 19:31, 24 February 2017

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Carbon dioxide levels cross 400 ppm threshold, highest in millions of years.

400 PPM: What's Next for a Warming Planet / Smithsonian

Concentrations of greenhouse gases in the atmosphere have reached this level for the first time in millions of years. What does this portend?
As the US House Committee on Science disagrees with climate science consensus, NASA’s chief climate scientist, Gavin Schmidt, is not optimistic: “In my opinion, we won’t ever see a month below 400 ppm”

2016 - https://www.theguardian.com/environment/2016/sep/28/the-world-passes-400ppm-carbon-dioxide-threshold-permanently

2015 - https://www.theguardian.com/environment/2015/nov/09/earths-climate-entering-new-permanent-reality-as-co2-hits-new-high

2014/2013 - https://www.theguardian.com/environment/2013/may/10/carbon-dioxide-highest-level-greenhouse-gas


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