We’ve observed that the climate has changed for millions of years on this planet.

Yes, and scientist have a pretty good understanding why it has changed in the past. Just as now we understand the climate has changed because of increased carbon dioxide in the atmosphere. Can you guess why there is more carbon dioxide in the atmosphere now than before the industrial revolution?

The post Industrial Revolution is the teensiest-tiniest microscopic doesn’t-even-register slice of time on the scale of the entire time this planet has had a climate.

Yes. And still, in this tiny slice of a time, the climate has changed a significant amount.

Just look at how climate change is being used by politicians and leaders.

Why should I look at politicians on a science matter. That's your problem. You should get your science from the scientist, not politicians.