Daily and weekly atmospheric carbon dioxide readings at Mauna Loa “have remained above 400 parts per million” in September. It’s momentous in that we mathematical beings associate importance with 100 unit intervals and that September is generally the low point in the annual atmospheric carbon dioxide curve.

The low point reflects the transition between summer and fall, when the uptake of CO2 by vegetation weakens and is overtaken by the release of CO2 from soils.

Keeling goes on to note that “by November, we will be marching up the rising half of the cycle, pushing towards new highs and perhaps even breaking the 410 ppm barrier.”

Rising levels of atmospheric carbon dioxide are a measure of greenhouse gas accumulation which causes global warming and climate change.