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● 400 PPM, Science Facts and Global Risks

● April 2017 / Research Report: We are heading for the warmest climate in half a billion years. So what’s the big deal?

No Going Back

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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