Another reminder that the earth has been much warmer and much colder in the past, without human intervention, and with CO2 levels much higher and much lower, showing that CO2 had almost no impact on climate.

That's not what that shows. CO2 levels at planetology scales are going to have significant effects on climate. Changing the amount of oxygen in a planets atmosphere could cause significant increase in the size of cellular life. Which then tends to make everything physically bigger. Hell, the "Big Death" 200 million years ago may have been from the release of a gas into the atmosphere from the oceans. It's just simply the case that if you start making major changes to a planets atmosphere, it's going to have massive effects on the planet. And, sometimes the planet is the thing that causes the atmosphere to change, causing further changes.

You want to argue that CO2 concentration from 220 to 400 ppm won't cause significant climate change, whatever. Don't argue that changing CO2 concentration from 220 to 9,000 ppm won't have an effect.