Unprecedented, Rapid Change in Our Atmosphere

Sadly, we live in a unique time in the history of Earth. There are many, many challenges today and ahead for all.

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Concentrations of the greenhouse gas carbon dioxide will likely reach 400 parts per million (ppm) for first time in human history in the next few days, say scientists at the Scripps Institution of Oceanography, and unless drastic action is taken, we’re on track to hit 450 ppm in the near future.

“I wish it weren’t true, but it looks like the world is going to blow through the 400-ppm level without losing a beat,” said Scripps geochemist Ralph Keeling, whose father Charles David (Dave) Keeling began the “Keeling Curve” to track daily CO2 levels recorded at Mauna Loa Observatory.

The last time the greenhouse gases were at 400 ppm was likely the Pliocene epoch, between 3.2 million and 5 million years ago.

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