Earth's carbon dioxide levels hasn't been this high in mankind's entire history

[peoli]

Carbon dioxide levels have hit an all-time high — again. In May (the month scientists use to compare year-to-year CO2 shifts), carbon dioxide in the atmosphere averaged 419 parts per million, according to data from Scripps Institution of Oceanography and the National Oceanic and Atmospheric Administration (NOAA).

Unfortunately, that in itself would hardly even classify as news anymore. But what really is striking is that CO2 levels haven’t been this high since before humans emerged as a species. We’d have to go to the Pliocene Epoch, between 4.1 to 4.5 million years ago, to see similar levels — a period when sea levels were nearly 80 feet higher and temperatures were about 7°F above the preindustrial era.

https://www.zmescience.com/ecology/pollution-ecology/carbon-dioxide-levels-highest-08062021/

[Under The Radar]

1. Isn't 525 the point of no return?

[Hugh_Lebowski]

2. See, it's happened before there was man, ergo, it cannot be caused by man

[abqtommy]

3. What I'm reading here is that CO2 levels were just as high at a time that pre-dated humans

as they are now. Is that right?