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Why did the 400ppm carbon milestone cause barely a ripple? | Andrew Simms | Environment | guardian.co.uk

Why did the 400ppm carbon milestone cause barely a ripple? | Andrew Simms | Environment | guardian.co.uk.

Al Gore: 400 PPM

Al Gore: 400 PPM.

 

Carbon dioxide levels hit historic high – Americas – Al Jazeera English

Carbon dioxide levels hit historic high – Americas – Al Jazeera English.

 

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