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In the Cambrian Period, atmospheric CO2 levels were 7000 ppm
In the Permian Era, atmospheric CO2 levels were 200 ppm.
Today, atmospheric CO2 levels are around 370 ppm, and The AlGore Acolytes intone that if we hit 400 ppm, all is Doom. Clearly that is poppycock.

Further, CO2 levels may not matter one whit, according to a new study that seems to utterly debunk the notion of CO2 acting as a Greenhouse... PV=nRT, the ancient formula, matters more than CO2 (which comprises about 0.04% of the atmosphere currently)

https://www.omicsonline.org/open-access/New-Insights-on-the-Physical-Nature-of-the-Atmospheric-Greenhouse-Effect-Deduced-from-an-Empirical-Planetary-Temperature-Model.pdf

As another Freeper summarized:

"The Cliffs Notes version:

The atmosphere’s density is all that matters for temperature. The composition of the atmosphere doesn’t influence the temperature. There could be no water vapor, or half water vapor, or 1% CO2, or 50% CO2.

The planetary temperature would still be the same and would be based primary on solar activity and how it heats that dense air and how the dense air retains that heat and for how long.

Atmospheric composition would make a big difference to plants and animals but as far as the temperature, weather and climate, it would make no difference at all. Only air pressure matters.

So simple, it is BRILLIANT."

So, at every mention of Greenhouse Gases and CO2 emissions, simply respond PV=nRT. Science.