The world passes 400ppm carbon dioxide threshold. Permanently https://t.co/33KvLJ52LB
— The Guardian (@guardian) September 28, 2016
via Twitter https://twitter.com/guardian
September 28, 2016 at 02:48PM
The world passes 400ppm carbon dioxide threshold. Permanently https://t.co/33KvLJ52LB
— The Guardian (@guardian) September 28, 2016
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