Carbon Dioxide and Levels Free People Check 

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Carbon Dioxide Levels Reach Record High, Ushering in a 'New Era of...

abcnews.go.com
CO2 levels will likely not drop below the milestone level

Northern hemisphere hits carbon dioxide milestone in April - Reuters

www.reuters.com
GENEVA, May 26 (Reuters) - Carbon dioxide levels throughoutthe northern hemisphere hit 400 parts per million (ppm) for thefirst time in ...

Guardian: Global carbon dioxide levels break 400ppm milestone | Environment |...

Concentrations of CO2 greenhouse gas in the atmosphere reached record global average in March, figures show, in a stark signal ahead of Paris climate talks

Carbon dioxide levels reach a new peak | News | Al Jazeera

www.aljazeera.com
The World Meteorological Organization announces an alarming new milestone.
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