Atmospheric CO2 just keeps on climbing

Another “milestone,” of a very problematic sort.

The concentration of carbon dioxide in the atmosphere peaked above 430 parts per million in 2025—the highest it has been in millions of years—according to data released by the National Oceanic and Atmospheric Administration and Scripps Institution of Oceanography at the University of California, San Diego on Thursday…

The last time that atmospheric CO2 concentrations topped 430 ppm was most likely more than 30 million years ago, Ralph Keeling, who directs the Scripps CO2 Program, told NBC News.

"It's changing so fast," he said. "If humans had evolved in such a high-CO2 world, there would probably be places where we wouldn't be living now. We probably could have adapted to such a world, but we built our society and a civilization around yesterday's climate." - Common Dreams