← Tasteful Corn on the Cob York U job: head of science library / physical sciences librarian → 412 ppm 28 April 2017 climate.change Two days ago atmospheric CO₂ jumped up to over 412 ppm (as measured at Mauna Loa and seen on GHG.EARTH). Not good. 412.63 ppm. ← Tasteful Corn on the Cob York U job: head of science library / physical sciences librarian →