Share 'Climate hits 400ppm of CO2 for first time in 3 million years'
"Latest reading: 400.15 ppm
CO2 concentration on May 19, 2013"
"Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are approaching 400 parts per million (ppm) for the first time in human history"
Climate hits 400ppm of CO2 for first time in 3 million years
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