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The world passes 400ppm carbon dioxide threshold. Permanently

The world passes 400ppm carbon dioxide threshold. Permanently

The Guardian - Brian Kahn for Climate Central, part of the Guardian Environment Network

We are now living in a 400ppm world with levels unlikely to drop below the symbolic milestone in our lifetimes, say scientists. Climate Central reports In the centuries to come, history books will likely look back on September 2016 as a major milestone for the world’s climate. At a time when …

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