Problem is this.
We can look at the data we have. It's accurate to a certain extent.
The idea that Global Warming is a natural cycle is well understood from paleo data covering the past 1 million years. Is there a difference between current climate, and the natural cycle? For the past million years the natural climate has oscillated between warm periods and ice ages. This...
ossfoundation.us
Here has a graph.
The last high CO2/temperature up and down lasted from 140,000 years ago to 90,000 years ago. So we see a period of 50,000 years where CO2/temperatures go from low to high and then back to low. 50,000 years. That's a long time.
Our current uptick started about 20,000 years ago, helping humans grow because the Earth got warmer. So if we take what happened about 100,000 years ago, we're only 2/5th of the way through this process.
The one before that started 245,000 years ago, to about 220,000 years ago. That's 25,000 years or HALF the time of the one that came after it. So, we'd be near the end of that one.
The one before that started at 330,000 years ago and lasted to 260,000 years ago, or 70,000 years. We'd not even be 1/4 the way through that one.
That one had temperatures much higher than they currently are. The one after has temperatures about the current level, the one after that was HIGHER than our current temperatures.
AND we don't know if the 100,000 year cycle has finished or not.