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Keeling Curve

CO2 Levels Topped 400 PPM Throughout The Northern Hemisphere Last Month

Reuters | Posted 07.26.2014 | Green

By Tom Miles GENEVA, May 26 (Reuters) - Carbon dioxide levels throughout the northern hemisphere hit 400 parts per million (ppm) for t...

Monthly Carbon Dioxide Concentration in our Atmosphere Will Surpass the 400 ppm Threshold in April

Keith Peterman | Posted 06.30.2014 | Green
Keith Peterman

The 400 ppm threshold should be a sobering wake-up call. It is time for us -- individuals, business leaders, and our policy makers -- to accept the science and face the civilization challenging issue of climate change.

Kate Sheppard

Happy Earth Day. We Just Reached Another Scary Climate Change Milestone

HuffingtonPost.com | Kate Sheppard | Posted 04.23.2014 | Green

In May 2013, it was big news when, for the first time, the concentration of carbon dioxide in the atmosphere hit 400 parts per million. Now, researche...

Planet Passes Major CO2 Milestone

The Huffington Post | James Gerken | Posted 05.10.2013 | Green

Atmospheric concentrations of carbon dioxide surpassed a notable milestone this week. They reached a daily average above 400 parts per million, re...