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2016 will go down in history as the first year of the rest of our lives — not in a good way.

For the first time, the concentration of CO2 in the atmosphere crossed above 400 parts per million and stayed there.
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Atmospheric CO2 levels last month averaged what a year ago was unprecedented in human history

US Politics / Liberal : Daily Kos

Almost exactly a year ago, the level of atmospheric carbon dioxide passed 400 parts per million (ppm) for the first time in human history. In fact, the global atmosphere hadn't seen such a concentration of the greenhouse gas in 3 mi...

Atmospheric Carbon Dioxide Levels Approach Record High 400ppm

Lifestyle / Green Living : Triple Pundit

For the first time in human history, atmospheric concentrations of carbon dioxide could rise above 400 parts per million throughout much of the Northern Hemisphere as soon as May 2013. The latest CO2 measurement was taken at the Mau...

Monthly Atmospheric CO2 Now Exceeds 400 ppm

Issues & Causes / Environmentalism : Planetsave

Reprinted from our sister publication, CleanTechnica. For the first time since people started tracking carbon dioxide in the earth’s atmosphere, the global average concentration of CO2 has surpassed 400 parts per million for an enti...

Atmospheric CO2 Levels Over Arctic Have Reached 400 Parts Per Million

Issues & Causes / Environmentalism : Ecogeek

The atmosphere over the Arctic has hit a troublesome milestone: the concentration of CO2 has surpassed 400 parts per million. Stations across the region in Alaska, Greenland, Norway and Iceland have recorded the measurements that ha...

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 ...

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