Latest CO2 Reading

401.11 ppm

April 17, 2014

Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are surpassing 400 parts per million (ppm) for the first time in human history

This Scripps Institution of Oceanography, UC San Diego website provides daily updates, analysis, and information on the state of climate. Follow @Keeling_curve to get daily updates of the CO2 value. Through this site, the public can also help support the continuation of the iconic Keeling Curve and of complementary measurements of atmospheric oxygen made at Scripps. These measurements enable society to witness climate change and inform strategies to address it.

Click below to go to the UC San Diego giving fund set up specifically to fund ongoing operations.

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The Scripps CO2 measurements at Mauna Loa have been supported for many years by the U.S. Department of Energy (DOE), and have more recently been supplemented by Earth Networks, a technology company that is collaborating with Scripps to expand the global GHG monitoring network. Support for website development was provided in part by the National Science Foundation (NSF). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of NSF.

Key IPCC Contributor to Deliver Fifth Annual Keeling Lecture

 David Victor, renowned expert on energy and climate change policy, to discuss challenges of climate change mitigation

The Keeling Lecture is part of the Jeffrey B. Graham Perspectives on Ocean Science Lecture Series. It takes place Read More ->

How are ice-core data and Mauna Loa atmospheric data made comparable?


Some readers of the Keeling Curve website have asked us about the graphs that show carbon dioxide concentrations since 1700 and over the past 800,000 years, which use a combination of data derived from analysis of the gas contained inRead More ->

An Update on Keeling Curve Funding Support

The last few months have been an interesting time for the Scripps Institution of Oceanography, UC San Diego O2 and CO2 programs, as we faced a very challenging budget situation. The central activity of these programs involves making observations… Read More ->

Comment on Recent Readings in Excess of 400 ppm

Instruments at the Mauna Loa Observatory in Hawaii recorded atmospheric levels of carbon dioxide greater than 400 parts per million on March 12, 2014 nearly two months earlier than the date on which the milestone was passed in 2013.

Scripps…

Why Don’t Global Surface Temperature Trends Match Atmospheric CO2 Increases?

Question submitted to Scripps Oceanography science magazine explorations now by Ruben M., Watsonville, Calif.

Great question Ruben! The surface temperature we experience every day is not expected to perfectly track CO2 because CO2 Read More ->