Tag Archives: Keeling curve

Carbon dioxide concentrations are nearly 400 ppm

The latest reported value from 4th of May 2013 was 399.68 ppm. That’s as close to 400 ppm as we (our civilization and planet, that is) have gotten. The best place to see the rapidly updated CO2 concentrations is at … Continue reading

Posted in Earth System Observer | Tagged , , , | Comments Off on Carbon dioxide concentrations are nearly 400 ppm