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Nearly Cooked: What 400 Parts Per Million Of Atmospheric Carbon Dioxide Really Means

Last month, Climate Central's Brian Kahn reported "In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world's climate." Kahn was referring to news that in a month when we would expect to observe the lowest concentration of carbon dioxide (CO2) in our atmosphere over the year, the Earth's atmospheric CO2 concentration remained over 400 parts per million (ppm).
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