Carbon dioxide levels hit 50% higher than preindustrial time 👀💔

[progree]

3. Yes, scary, I excerpted a bit --

On at least a couple of days in 2021, in fact, Scripps researchers observed daily levels exceeding 420 ppm, notching up another disastrous first in human history. (( "420 day", sounds familiar -Progree ))

((back 4 million years ago when levels were last this high -Progree)) The high levels of accumulated atmospheric CO2 during the late Pliocene meant the world was a very different place back then, about 2 to 3 degrees Celsius warmer compared to the pre-industrial period baseline.

In fact, Earth's polar regions were so warm they were grown over with forests, and the ice that would later form in Antarctica and the Arctic was still liquid water – swelling the oceans to a sea level over 20 meters ((65 feet)) higher than it is today.

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NOAA was saying last year that about half of our CO2 emissions are absorbed by the land and oceans (making the latter more acidic),
meaning that the other half adds to the CO2 atmospheric levels.

Implying to me that even with an immediate 50% cut to our CO2 emissions, it will only just stabilize today's already very problematic high levels. And then we have methane and other GHG emissions that need to be drastically reduced too.