I agree with Gore, which is highly unusual, it's not a serious conversation. And I think Gore is an idiot.
The question about CO2 and modern climate change is unrelated to whatever happened a million years ago. And yes, CO2 levels have been much higher in the distant past.
So what? Does that mean climate change isn't real, and caused by humans due to GH gases being emitted? Of course not. Does it mean it IS real and caused by humans? Nope. It's an irrelevant discussion, to me.