If you take a look at this graph, CO2 in purple, Temp in blue, it looks like there is no correlation between them, except possibly reverse correlation. But you can see a sharp rise in CO2 in the present Holocene period though, there hasn’t been such a sharp rise since the Cretaceous. Is this a warning that things are going bad for the human race?
If you were a disingenuous scientist wanting to prove climate change, you might just pick the “hockey stick” on the CO2 line back to, say, 3 million years. But science like that just de-rails your argument when it’s discovered, think about all the stick Al Gore received.