The Keeling Curve Hits 420 PPM

Rob MonroeMost Popular, Videos

Levels of the greenhouse gas carbon dioxide eclipsed 420 parts per million for the first time in human history in 2021. Scripps Institution of Oceanography updated this animation, which explains the rise of carbon dioxide concentration in the atmosphere over the past 300 years and the measurement our researchers collect at Hawaii’s Mauna Loa, known as the Keeling Curve. When … Read More

Statement from Scripps Oceanography, UK Met Office on Record High CO2 Buildup

Rob MonroeAnnouncement, Climate in the News, Measurement Notes, Outreach

Researchers Richard Betts from the UK Met Office Hadley Centre and Ralph Keeling of Scripps Institution of Oceanography, UC San Diego issued the following statement today regarding new record levels of CO2 in the atmosphere in the context of the Covid-19 pandemic. The full text of the statement with graphics is available with graphics through this link and is included … Read More

What Does This Number Mean?

Rob MonroeMeasurement Notes

Repost of April 2013 entry The Mauna Loa carbon dioxide (CO2) record, also known as the “Keeling Curve,” is the world’s longest unbroken record of atmospheric carbon dioxide concentrations.  

A Keeling Curve Funding Update – April 2015

Rob MonroeOutreach

The Scripps Institution of Oceanography, UC San Diego O2 and CO2 programs have received funding from multiple sources that put these operations on a relatively secure footing for the next few years.