Sometime last night while many of us slept, humanity past a milestone.
The concentration of carbon dioxide exceeded 400 parts per million – the highest concentration of CO2 in millions of years. The last time CO2 was at this level was roughly 3 million years during the mid-Pliocene. At that point the plant was at least 3-3 degrees warmer and sea levels 25 meters higher.
Reports coming in:
- From the ABC – “Global greenhouse gases in the atmosphere have reached an ominous milestone that is unprecedented in human history. The world’s longest measure of carbon dioxide in the atmosphere has reached 400 parts per million (PPM) for the first time in three million years…”
- The Scripps Institution of Oceanography is reporting slightly under 400ppm, but NOAA reports 400ppm.
Who know’s were we will be by centuries end: at this point with a lack of concentrated global effort, 600ppm looks likely.
We’re well on the way to doubling the level of C02 since the mid-nineteenth century (roughly 280ppm back then).
Welcome to the Anthropocene.
I’ll post thoughts on this later.