Let's just talk about the recent (past 500 years) change in the insulation properties of the planet's atmosphere.

It's been in a constant burbling flux that has many factors, fires, volcanoes, etc all contribute to the steady level of churn.

The substantial change away from baseline is well recorded, tied back to sources by isotopes, and has a single cause - carbon dioxide by products from the combustion and release of previously sequestered carbon sources.

There's no doubt about that - there are multiple atmospheric libraries of gases from various parts of the world to back that up.

The data source sets for atmospheric makeup and ocean thermoclines are deeply tied into Cold War nuclear test monitoring and watching enemies, not some hippy dippy eco friendly new age hand wavyness.