How much Co2 is supposed to be in the atmosphere bro? Is 400-500ppm not a correct amount?

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Not sure if this is a joke or just a jab, or what your point is in asking me that in response to this podcast.

There is no “correct” amount because it rises and falls with solar cycles, geological cycles, etc.

But it’s clear that the concentration post-industrialization is far above (like 2x) that of pre industrial levels.