Chart of the Century: The Keeling Curve Edges Up to 400 ppm

Facts matter: Sign up for the free Mother Jones Daily newsletter. Support our nonprofit reporting. Subscribe to our print magazine.


For the past few months, the Keeling Curve, which measures atmospheric carbon dioxide concentrations at Mauna Loa Observatory, has been rising toward its annual late-May peak. Right now it’s at 399.5, and any day now it could pass 400 ppm for the first time in modern history. So take a nice long look. This could be the last time in your life that you get to see carbon dioxide levels below 400 ppm on planet Earth.

THE END...

of our fiscal year is Thursday, June 30, and we have a much larger fundraising gap than we can easily manage with only days left to go.

Right now is no time to come up short: If you value the hard-hitting, democracy-protecting, justice-advancing journalism you get from Mother Jones, please help us keep charging as hard as we possibly can with a much-needed and much-appreciated donation today.

payment methods

THE END...

of our fiscal year is Thursday, June 30, and we have a much larger fundraising gap than we can easily manage with only days left to go.

Right now is no time to come up short: If you value the hard-hitting, democracy-protecting, justice-advancing journalism you get from Mother Jones, please help us keep charging as hard as we possibly can with a much-needed and much-appreciated donation today.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate