Green Shift: 400

This happened today.

Via theguardian.co.uk:

Global Carbon Dioxide in Atmosphere Passes Milestone Level

For the first time in human history, the concentration of climate-warming carbon dioxide in the atmosphere has passed the milestone level of 400 parts per million (ppm). The last time so much greenhouse gas was in the air was several million years ago, when the Arctic was ice-free, savannah spread across the Sahara desert and sea level was up to 40 metres higher than today.

 

 

 

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