JimBob
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Is this the study you are citing? No, there are many other different peer reviewed studies.
https://www.sciencedaily.com/releases/2009/06/090618143950.htm
The scientists concluded CO2 was not "the main trigger" of climate change, but it is intimately linked - possibly because of CO2 stored in glaciers and the sea, where warmer climate sees that CO2 released. Depends, many different factors affect climate change. As to which was the main cause requires analysis.
The other issue is measurement. Measuring CO2 going back even 100 years uses a very different method than even 20 years ago, where satellites and other digital tools were used. The study measured CO2 levels in plankton and then estimated what CO2 was going back millions of years...Ice cores go back about 800,000 years. Beyond that other methods are used.
Alas, could that lead to erroneous conclusions? One data set is an estimate, the other data set uses actual measurements. They were then combined for the 2m year timeline. These conclusions are peer reviewed and are constantly modified an new information comes to light.
That said, it doesn't really matter. Humanity should reduce all forms of pollution. My biggest concern is this bizarre obsession with CO2, where potentially bigger problems could actually lead to an extinction event should we pollute our land and seas with enough toxic waste. Yes, but the CO2 obsession is not bizarre. Do some research on CO2 and how it has varied over time and why and the consequences of that variation.
And to your question about CO2, what is a good temperature for planet Earth, factoring in the northern and southern hemisphere and all types of biome? Agricultural societies have been around for around 9,000 years +- and industrial societies about 300 years. World population has grown by 7 billion over the past 250 years. If the rules change, then all the these get impacted and maybe in an adverse way.